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 Circular Slide Rules
  Gilson, Aristo, Concise, Sama + Etani, Hemmi, Norma, SINCO, Pickett + Others
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Sphere Research Coporation, CLICK to visit! Sphere Research Corporation
3394 Sunnyside Rd.
West Kelowna, BC, Canada V1Z 2V4
Phone: +1 (250) 769-1834
FAX:+1 (250) 769-4106

A great source for test equipment, repairs, calibrations, useful metrology information, and of course, SLIDE RULES!

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Datalyzer Datefinder

CIRCULAR SLIDE RULES

JUST IN! LOTS of NEW, PERFECT Concise/Sama & Etani Data Centers and Circulars.
go right to the catalog! Skip the INTRO, Go RIGHT to the CATALOG!
Faber Castell 8/10

* Circular rules offer greater scale length in a smaller physical package, so that you don't poke the guy at the next desk in the eye with that 20 inch straight rule in your quest for better resolution. Concise circular rules also offer some interesting 'look-up' and conversion features to the basic rule for added utility. Circulars come in plastic and metal construction (plus paper when made as perrygrafs), but not in wood.
* To make your life easier, and help you find exactly what you want, we have broken the on-line slide rule catalogs into smaller sections. Just CLICK on the icon of the rule type you are looking for at the left, to see the matching catalog. Large graphical catalogs are a bit SLOW, please give them time to load.

You can order anything here just by picking up the phone, and calling (250) 769-1834 during normal office hours, 8:30AM to 4:30PM PST, or FAX to (250) 769-4106. OR, Email your order to Susan CLICKHERE.

Shipping*SHIPPING: Preferred and Alternate Methods as of June 4, 2013, CLICK for FULL DETAILS ON OUR FAQ Page. Rates are now changing rapidy, often with little notice to us, so all the data has been transferred to the FAQ page for speedy updating.

* E-Mail Susan if you want a quote for shipping to other destinations, or for something heavy. Sorry, we can't safely send most individual small parts in a regular letter envelope, they get destroyed by the automated handling equipment. Sometimes we can ship very rugged parts or rules in a small padded envelope by letter post. Ask Susan.

*If we have your valid data on file, you can just click on the ORDER email link to place an order and indicate your approval to bill, and we will do the rest. We keep your active information for ONE YEAR for your convenience.

*If this is the first time you have dealt with us, you can phone +1 (250) 769-1834 or FAX +1 (250) 769-4106 to supply the billing info, or send it by the email link, as you prefer. We accept VISA/MC, international money order, Paypal (to Susan@Okanagan.net), and bank wire transfer. Please note that there are transaction fees with Paypal and wire transfer payments, the wire transfer fee is frankly horrifying.

We accept VISA/MC or international money order

The CATALOG will appear below shortly!

CATALOG: JUST SCROLL DOWN TO SEE EVERYTHING !down
MODEL / PRICE
INFO / SCALES
QTY.
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NEW SETS JUST ARRIVED!



SINCO

SINCO
Scientific Instruments Co.

Model 250
ROTOTRIG 100
Professional Trig Slide Rule

NEW
$135 Ea.

JapanUSA

Model 250, CLICK for bigger PIC!
Click for BIGGER PIC!

BRAND NEW SETS.
A compact 80mm/3 inch pocket duplex circular slide rule with box, case and factory instructions. Duplex Cursor has scale names imprinted, as well as the rule body. Rotating disk and stationary disk on the front side, stationary disk on the back. Multi-scale sine/tan scales, allowing high resolution, and sophisticated cursor assembly for long life. Some minor box marks from storage, contents are perfect.

BRAND NEW, complete with BROWN vinyl case and manual. These fit perfectly in a shirt pocket! We have one additional set with no box cover, only $120.

(13 Scales, Duplex marked cursors)
Front
- L, CI, C, D, A, K
Back
- D, T, S, T, S, T, TS

Have 4


Includes


BOX
CASE
MANUAL
Model 250, CLICK for bigger PIC!
Click for BIGGER PIC!

Model 250, CLICK for bigger PIC!
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Model 250
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Pickett
PICKETT
Model 101C


US$159

Made in USA

4 Inch Duplex Circular

Pickett's most popular aluminum circular slide rule, with decimal to fraction conversions and additional scales on rear face. Very nice rule, complete with gold embossed black belting leather case and original Pickett manual.

This is a powerful lightweight pocket rule, with performance equal to a much larger straight rule. Rotating dual cursors on one side (with scales ID's on cursor), single on the reverse. Rule, manual and case are very good condition, looks new, but may be used considering the box condition. PIC IS the actual rule offered.

(15 Scales + conversions)
Front
- C, CI, A, Af, L, Fa, LL2, LL1, DS, DT, M
Back
- C, S, ST, T, Fractional Conversions

Just 1


Includes


LEATHER CASE
MANUAL
BOX
Pickett 101C, CLICK for bigger PIC!
CLICK for bigger PIC!

Pickett 101C, CLICK for bigger PIC!
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Pickett 101C
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Pickett
PICKETT
Model 103ES
Mark-Up
Calculator
+ Sliderule


$119 Ea.

Made in USA

Duplex 4 Inch Circular

Pickett's popular commercial circular mark-up calculator on one side, and full circular slide rule on the reverse. Very nice yellow coated aluminum and plastic rule, with operating instructions on the face, excellent unused condition. We get endless requests for this type of rule, but they are very hard to find. Has unusual, fractional conversion scales as well as regular scales.

PIC IS NOT the actual rule offered, but looks the same, complete with black leatherette case. Sorry, no manual available.

(3 Scales + 6 scales)
Front
- Selling Price Basis, Cost Basis, Price
Back
- C, CI, A, Af, L, Fa

Just 1


Includes


Rule
Case
Pickett 103ES, CLICK for bigger PIC!
CLICK for bigger PIC!

Pickett 103ES, CLICK for bigger PIC!
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Pickett 103ES
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FINALLY, WE HAVE SOME STOCK!
Datalizer, CLICK to visit!

Datalizer
8 Inch
Date Finder

NEW!
$39 Ea.

USA

Brand NEW 8 Inch Circular Date Finder Slide Charts from Datalizer

This Desk Sized (8 inch) plastic Date Finder is a highly requested circular from business people, purchasing agents, production managers and others, we now have them in small quantities (the normal buy is 500+ from Datalizer). This version does both days and weeks from now (or any date) to any date. Very handy for determining when those '8 week delivery' items will really arrive. These will be a stock item for us, so we can supply any quantity with some delay. Yes, Made in USA.

(2 Scales, Instructions on Face)
Front
- Date, Days/Weeks
Back
- Blank

8
CLICK for bigger PIC!
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Datalizer 8 Inch Date Finder
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NEWNEWNEW

8 Inch Duplex
Circular


GILSON
Binary


$249 Ea.

DOWNLOAD the original manual from HERE!

Made in USA

Gilson's most famous aluminum circular slide rule, with alternating yellow/white stripes and fractional converter/operator scales. This rule was made by Gilson in Florida but was often sold by numerous other companies, including POST, Dietzgen, Tavella, Bruning and others.
This is a very powerful rule, with 3 sets of trig scales (sin/tan), giving performance equal to a much larger straight rule, and still has the original printed manual.

The rule has unique fractional 'binary' scales that permit operations directly with fractional numbers, and also drill size scales. Rotating dual cursors with a slip clutch on one side, and a single cursor on the other. Excellent condition rule and case. Cases for these rules were made of random fabric materials at the factory, and each one is a bit different. The set offered IS NOT the exact rule pictured, but looks very similar, the metalwork is not quite as shiny, but has the Dietzgen manual included. Second rule is in the shiny green case, the rule has a slight green tint, and comes with the POST manual, their version of this famous rule. Your choice, same price..

(21 Scales !)
Front
- C, CI, A, K, L, Log Log (1.0015-1,000,000), fractions, fractions, drill/thread, mm
Back
- degrees, sines, tans, degrees, sines, tans, degrees, sines, tans, Fractional Conversions

Have 2

Includes
Case
Manual
CLICK for bigger PIC!
CLICK for bigger PIC!


CLICK for bigger PIC!
CLICK for OTHER SIDE!

Gilson Binary
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50mm Slide Rule Coins!

Slide Rule Coins, CLICK for bigger PIC!
Slide Rule Coins, CLICK for bigger PIC!

Slide Rule Coins, CLICK for bigger PIC!
Slide Rule Coins, CLICK for bigger PIC!

Slide Rule Coins, CLICK for bigger PIC!
Slide Rule Coins, CLICK for bigger PIC!

Slide Rule Coins, CLICK for bigger PIC!
Slide Rule Coins, CLICK for bigger PIC!

Technetium/Pale Horse Designs
Slide Rule Coins

NEW!
Midnight Coin $26
Daylight Coin $29
Both $52

  

Technetium/Pale Horse Designs
50mm Slide Rule Coins

Brand NEW, in presentation packages!.
The great creation from Technetium and Pale Horse Designs is now at the SRU. We have made some color changes to improve the visibility and appearance, and had custom presentation cases made for them. They are now in stock, and one or both can ship cheaply in a small padded bag. You can see the detailed info on the new design HERE.

One coin is blue and nickel plated, one is satin gold and silver finish with an emerald accent. There's only 1 run of 40 of each style available, and when they are gone, that's it. They are incredibly beautiful to look at and amazing to touch, with a working slide rule on the face (the two outer scales are C and D, the innermost is a Log Log scale, and smith chart on the reverse. These 50mm diameter coins are heavy and thick (5mm), not a flimsy plastic item, but a solid metal good luck piece or pocket fancy you will enjoy for a long time.

Originally designed as Geocaching coins by Dutch Geocacher Technetium, they are a truly unique slide rule item. The core is die cast zinc alloy to achieve the high detail, with either gold or silver toned plating, or nickel plating, depending on the design. The inner triangle design is Sierpiski's fractal triangle. You can get a set of both coins, or just one, as you wish. The presentation box has a viewing window, and each coin is surrounded by a die cut foam holder to protect it. These look nice displayed on a desk in our small slide rule stands.


(3 Scales, Smith Chart)
Front
- C, D, LL02
Back
- Smith Chart

click for bigger PIC!
CLICK for bigger PIC!


SORRY, Midnight Coins SOLD OUT
10 Sunlight

Includes


PRESENTATION CASE
click for bigger PIC!
CLICK for bigger PIC!

Midnight Coin
BLUE, click for bigger PIC!
CLICK for bigger PIC!

Sunlight Coin
Gold Tone, click for bigger PIC!
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Technetium/Pale Horse Slide Rule Coin
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FINALLY, WE HAVE SOME STOCK!
Datalizer, CLICK to visit!

Datalizer
Profit Dial

NEW!
$9 Ea.

USA

Brand NEW Circular Profit Dial Slide Charts from Datalizer

This shirt-pocket sized (4 inch) plastic Profit Dial is the most requested circular from business people, we now have them in small quantities (the normal buy is 500+ from Datalizer). This version does both profit on cost and profit on selling cost, making it very handy in any sales environment. These will be a stock item for us, so we can supply any quantity with some delay. Yes, Made in USA.

(2 Scales, Instructions on Rear)
Front
- Price, %Profit
Back
- Instructions

44
CLICK for bigger PIC!
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CLICK for bigger PIC!
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Datalizer Profit Dial
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FINALLY, WE HAVE SOME STOCK!
Datalizer, CLICK to visit!

Datalizer
Date Finder

NEW!
$9 Ea.

USA

Brand NEW Circular Date Finder Slide Charts from Datalizer

This shirt-pocket sized (4 inch) plastic Date Finder is a highly requested circular from business people, purchasing agents, production managers and others, we now have them in small quantities (the normal buy is 500+ from Datalizer). This version does both days and weeks from now (or any date) to any date. Very handy for determining when those '8 week delivery' items will really arrive. These will be a stock item for us, so we can supply any quantity with some delay. Yes, Made in USA.

(2 Scales, Instructions on Rear)
Front
- Date, Days/Weeks
Back
- Instructions

40
CLICK for bigger PIC!
CLICK for bigger PIC!


Datalizer Date Finder
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Unusual New Concise Rule!

Hope
HOPE
CONCISE

Model 740
Metric Converter

NEW!
$33 Ea.

Japan

Brand NEW Sets, mint condition!. The Hope 740 is another custom rule made by Concise and marketed under another label, in this case Hope, who offered both circular and straight rules from Japan. The 740 is a metric converter built on the Concise data center 'chassis'. The front is a compact 3 inch pocket circular slide rule, attached to a rectangular data center card (with side inch/cm rulers on the back). The rear side has a C/F temperature scale, inch and centimeter rulers and a nice table of constants. A very handy rule for quick conversions of temperature, length, volume, weight and area, PLUS an extra C/D scale set for general calculations. Complete with black/clear vinyl slip case, and short factory manual, all in MINT CONDITION!

This ia a very nice looking item from Concise that will be very handy in your shirt pocket!


(4 Scales, 2 back rulers, Constants)
Front
- VOL/WEIGHT/AREA/LENGTH C, D
Back
- Rulers, Constants

Just 8 pieces!

Includes


CASE
MANUAL
CLICK for bigger PIC!
CLICK for bigger PIC!

CLICK for bigger PIC!
CLICK for bigger PIC!


Hope 740
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ALL GONE!

Sama and Etani
CONCISE
Sama & Etani

Model 600CE
Chemical Engineering

NEW!
$79 Ea.

JapanUSA

Brand NEW Sets, right from Mr. Sama's final personal stock. The 600CE is a compact 2 1/2 inch pocket circular slide rule, attached to a rectangular data center card (with side inch/cm rulers) complete with pull-out chemical data insert. The rear side has a Detailed Periodic Table of the Elements (to 103), the center has a pull out data chart with the full CE double sided data chart, HERE and HERE. These were custom made for ESSO, an outstanding and useful device, incredibly handy if your work in the chemical/science area. Complete with white vinyl slip case, and factory manual, all in MINT CONDITION!

THIS IS THE MOST REQUESTED Data Center from Sama and Etani, these are the first brand new ones in the CE format we have ever seen. Sama and Etani had to stop production of these rules many years ago because teachers complained students used them to cheat on exams, and so a fantastic reference tool was lost forever. These are the very last stock right from Mr. Sama himself, when these are gone, no more can be had. This is a VERY hard rule for us to source, so please don't miss your chance to get one!

(8 Scales, 2 side rulers, Periodic Table + Data Card)
Front
- D, C, CI, L, A, S, T, K
Back
- Periodic Table
Inside
- Data Card, Chemical Engineering

SORRY, All are gone!

Includes


CASE
MANUAL
600CE Set, CLICK for bigger PIC!
CLICK for bigger PIC!

600CE Back, CLICK for bigger PIC!
CLICK for bigger PIC!


Sama + Etani 600CE
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Sama and Etani
CONCISE
Sama & Etani

Model 90
Metric Data Rule

NEW
$44 Ea.

JapanUSA

BRAND NEW, PERFECT, MINT CONDITION.
A compact 90mm/3 inch pocket circular slide rule with metric conversion factors and temperature conversion on the reverse side. Cursor has scale names imprinted, as well as the rule body. Excellent quality compact rule, complete with vinyl slip case and factory manual.

BRAND NEW, complete with WHITE vinyl case and manual. These fit perfectly in a shirt pocket!

(8 Scales, Metric + Temperature Data)
Front
- L, D, C, CI, A, K, S, T, K
Back
- Metric + Temperature Data

Have 28


Includes


CASE
MANUAL
Model 90, CLICK for bigger PIC!
Click for BIGGER PIC!

Model 90, CLICK for bigger PIC!
Click for BIGGER PIC!

Model 90
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Sama and Etani
CONCISE
Sama & Etani

Model 200EE
Electrical Engineering Data Center

NEW
$39 Ea.

JapanUSA

BRAND NEW, PERFECT, MINT CONDITION.
A compact 2 1/2 inch pocket circular slide rule, attached to a rectangular data center card with pull-out insert. The rear side has a color coded reactance chart, the center has a pull out data chart with color codes, wire data, constants, formulas and terms. An outstanding and useful device, incredibly handy if you are in the electronics industry. These fit perfectly in a shirt pocket. Very nice rule, complete with BLACK vinyl slip case and manual. Note, just a few WHITE cases left.

*CLICK HERE to see side one of the Data Center Insert

*CLICK HERE to see side two of the Data Center Insert

BRAND NEW, complete with vinyl case and manual.

(8 Scales, Side Rulers, Reactance Chart + Data Card)
Front
- D, C, CI, L, A, S, T, K
Back
- Reactance Chart Inside
- Data Card, Electronics

Incredibly Useful!
Have 36


Includes


CASE
MANUAL
200EE Front

200EE Back

200EE
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Almost gone!

Sama and Etani





CONCISE
Sama & Etani

Model 700EE
Metric Marvel
Electrical Engineering Data Center

NEW
$35 Ea.

JapanUSA

BRAND NEW, PERFECT, NOT-IMPRINTED.
A compact 2 1/2 inch pocket circular slide rule, attached to a rectangular data center card with pull-out insert. The rear side has a metric data conversion table, the center has a pull out data chart with color codes, wire data, constants, formulas and terms. Ideal for those in the electronics industry working with metric units. Very nice rule, complete with vinyl slip case and manual.

*CLICK HERE to see side one of the Data Center Insert

*CLICK HERE to see side two of the Data Center Insert

BRAND NEW, complete with vinyl case and manual.

(8 Scales, Side Rulers, Metric Data + Electronics Data Card)
Front
- D, C, CI, L, A, S, T, K
Back
- Metric Data
Inside
- Data Card, Electronics

SORRY, SOLD


Includes


CASE
MANUAL
700EE Front

700EE Back
700EE
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MORE NEW SETS JUST ARRIVED from Mr. Sama!




Sama and Etani
CONCISE

Sama & Etani

Model 700CE
Metric Marvel
Chemical Engineering Data Center

NEW
$35 Ea.

JapanUSA
BRAND NEW, PERFECT, NOT-IMPRINTED.
A compact 2 1/2 inch pocket circular slide rule, attached to a rectangular data center card with pull-out insert. The rear side has a metric data conversion table, the center has a pull out data chart physical data, constants, formulas and terms. Ideal for those in any general science area working with metric units. Very nice rule, complete with red vinyl slip case and manual.

*CLICK HERE to see side one of the Data Center Insert

*CLICK HERE to see side two of the Data Center Insert

BRAND NEW, complete with vinyl case and manual. Many people asked for the periodic table, as was found on the back of the 600ST (no longer available), so we found some beautiful laminated color tables that fit perfectly inside the case with the rules. Add one to your set for a small charge. We have no stock of the periodic tables left, but have more coming.

(8 Scales, Side Rulers, Metric Data + Physical Data Card)
Front
- D, C, CI, L, A, S, T, K
Back
- Metric Data
Inside
- Data Card, Physical Data

Have 12


Includes


CASE
MANUAL
700CE Front

700CE Back

700CE
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MORE NEW SETS JUST ARRIVED from Mr. Sama!




Sama and Etani




CONCISE
Sama & Etani

Model 700MM
Metric Marvel
Metric Data Center

NEW
$35 Ea.

JapanUSA

BRAND NEW, PERFECT, MINT CONDITION.
A compact 2 1/2 inch pocket circular slide rule, attached to a rectangular data center card with pull-out insert. The rear side has a metric data conversion table, the center has a pull out unit conversion data chart with prefix terms. Ideal for those working with metric and imperial units. Very nice rule, complete with vinyl slip case and manual.

*CLICK HERE to see side one of the Data Center Insert

*CLICK HERE to see side two of the Data Center Insert

BRAND NEW, complete with vinyl case and manual.

(8 Scales, Side Rulers, Metric Data + Factor Conversion Data Card)
Front
- D, C, CI, L, A, S, T, K
Back
- Metric Data
Inside
- Data Card, Factor Conversion Data

Have 20


Includes


CASE
MANUAL
700MM Front

700MM Back

700MM
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NEW

Williams
Decimal/Metric Equivalent Calculator


$26 Ea.

Made In USA

4" Circular Slide Chart
NEW, EXCELLENT condition. This handy pocket sized device gives the metric and decimal inch quivalents of fractional inch values. 3/8 inch converted to 0.3750 inches and 9.52500mm, and so forth. Incredibly useful in a machine shop or for drafting values, etc. Made of two part heavy plastic film. Just a few, don't miss getting one!

(2 Scales)
Front - Fractional value to 1 inch[ Decimal and MM values ]
Back - Blank
Just 5


Includes


Rule
CLICK for bigger PIC!
Click for a BIGGER PIC!
<
Williams Inch Converter
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NEW

Norma
Grafia 190


$115 Ea.

Germany

8" Circular Slide Rule
LATE MODEL, EXCELLENT condition. This beautiful satin finish aluminum circular rule was intended for the graphics industry, used for sizing paper and images for enlargement, reproduction, etc, but is a fully functional C/D scale rule for any general math purpose (mark-up/discount, multiplication, division, percentages, etc.). The rule has an inner rotating disk inside a stationary one, and an ingeniously hung movable cursor which looks as if it hangs in mid-air over the rule body. If you have wanted a truly elegant circular to add to your collection, this is the rule! Beautifully made and finished, the back is covered in a textured black gripping surface. Includes black vinyl case, with instructions (in German) on the rear. Norma is a German slide rule maker, Grafia was their trade name for these graphic arts circular rules.

(2 Scales)
Front - C, [ D ]
Back - Blank
SORRY, SOLD


Includes


CASE W/ ATTACHED MANUAL
Norma Grafia 190, CLICK for bigger PIC!
Click for a BIGGER PIC!


Norma Grafia 190, CLICK for bigger PIC!
Click for a BIGGER PIC!

Norma Grafia 190
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Pickett
PICKETT
Model 104C
Pocket Profit
Calculator


$89 Ea.

Made in USA

8 Inch Simplex Circular

Pickett's popular full-sized plastic commercial circular slide rule, with mark-up, margin and discount functions. Very nice rule, with operating instructions right on the face, very good condition, includes a Pickett envelope case. This has a few surface scuffs, but as you can see, they do not afffect operation at all. We get endless requests for this type of rule, this is the first one we have found in 2 years.

PIC IS the actual rule offered.

(4 Scales + directions)
Front
- Profit mark up , Unit Cost, Profit Margin %, Discount %
Back
- Blank

SORRY, SOLD


Includes


Rule
Envelope
Pickett 104C Pocket Profit Calculator, CLICK for bigger PIC!
CLICK for bigger PIC!

Pickett 104C
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Feild's Hydraulics Calculator
for gravity flow in pipes


$59 Ea.

USA

Also referred to (incorrectly) as Fields or Field's Hydraulic Calculator, this is the original 1950 copyright design from James W. Feild, still produced today by his family. These are BRAND NEW, freshly manufactured by Perrygraf, complete with protective paper sleeve. Full directions are on the rear of the calculator, so they can never be lost. Used to calculate the gravity flow of fluids in pipes, this classic design remains the gold standard almost 60 years after its invention. We get requests for this constantly, but could never find a source other than a few tattered used ones. We are happy to finally have a reliable source, and can now provide these new calculators in quantity. This is arguably the most famous (and maybe the most complex) Perrygraf ever made, and still in high demand. These are made of heavy white card stock, with black printing, and come with a manila envelope sleeve.
(8 Scales, 5 Indicators, + directions)
Front
Scale A-Pipe Diameter, Rate of Flow, Roughness, Slope, Scale C-Ratio of Liquid Depth to Pipe Diameter, Scale D-Ratio of Liquid Depth to Pipe Diameter, Velocity, Scale B-Pipe Diameter
Back
- Directions
SORRY, ALL GONE


Includes


Rule
Cover
6 Inch, 4-level Circular Slide Chart

Feild's Hydraulics Calculator, CLICK for bigger PIC!
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Feild's Hydraulics Calculator
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Blundell Harling
Blundell-Harling

Radiac No. 1
Z8/6665-99-911-0117

NEW

$79 Ea.

Made in England
Radiation Effects Rule
Radiac No. 1


NEW, mint condition, UK military radiation effects rule, computes radiation dosage over land or sea (disks are removable and can be flipped over for alternate scenarios (blue/water, white/land). This is the original version.


The set includes the rule with changeable disks, and snap closure pouch.
CLICK for bigger PIC!Full instructions
are on the rule reverse side
.

Interestingly, while it allows you to elegantly compute your radiatioon dosage, it does not say how much is fatal. An unfortunate oversight, if you should happen to really need to use this rule.
Last 1


Includes


Rule
Pouch
Case, CLICK for bigger PIC!
Case, CLICK for bigger PIC!

Radiac Rule, CLICK for bigger PIC!
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Radiac No.1
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Blundell Harling
Blundell-Harling

Radiac No. 1 Mk2
6665-99-780-8137

NEW

$79 Ea.

Made in England
Radiation Effects Rule
Radiac No. 1 Mk2


NEW, mint condition, UK military radiation effects rule, computes radiation dosage over land or sea (disks are removable and can be flipped over for alternate scenarios (green/water, red/land). This is the flashy Mk2 revised version, wahoo.


The set includes the rule with changeable disks, and snap closure pouch. Full instructions are on the rule reverse side.

Interestingly, while it allows you to elegantly compute your radiatioon dosage, it does not say how much is fatal. An unfortunate oversight, if you should happen to really need to use this rule.
SORRY, SOLD


Includes


Rule
Pouch
Radiac
Radiac Rule, CLICK for bigger PIC!
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Radiac No.1 Mk2 Rule
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Aristo
Aviat
615

ARISTO

Germany

$295 Ea.



Dark brown case , CLICK for bigger PIC!
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5.5" Circular Aviation Slide Rule
Constructed with one rotating film disk, and rotating cursor on each side. A very sophisticated and beautiful flight computer for doing altitude, pressure, time, temperature, and fuel problems.

The rule give simultaneous solutions in both metric and US/Imperial units, without being cluttered or hard to interpret, an outstanding mechanical and artistic design. Still in demand today among many pilots, but very hard to find.

Made of 'Aristopal', comes complete with zippered leather pouch. We have had many requests for this rule from all over the world, this is the first one we have had available for sale in a year, excellent condition. The rule for sale IS NOT the rule pictured at right, but looks the same, except for minor variations in the the case (black or brown). A full english manual copy is included! We can also supply the german manual if you prefer.




(22 scales on front, 6 scales on rear)
Front - see image
Back - see image
Just 1


Includes


Rule
Leather Case
Manual Reprint
Aristo 615 Aviat, CLICK for bigger PIC!
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Aristo 615 Aviat, CLICK for bigger PIC!
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Aviat 615 Rule
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Faber-Castell
Faber-Castell
Circular
8/10

$195 Ea.


Made in Germany
*Circular Slide Rule
Uncommon Faber-Castell circular, BRAND NEW, MINT plastic body rule with rotating scale and 7 line cursor, two color (red/black) scale markings, trademark mint green accent stripes on primary scales, yellow stripes on dual cycle scales, and expanded trig scales. The rule is self documenting on right hand side for all scales, the back is blank. An exceptionally high quality and attractive circular rule, seldom seen outside of Europe.

There are two versions of this rule, one where the reverse side is blank (this rule), and one with setting data (see german version above). The set comes with a beautiful dark green zippered leather case with gold logo embossed in the leather, and original English manual. CLICK HERE to see the English operating manual for download.

(11 Scales)

Front - K, A, L, D, [ C, CI, B, T1, T2, S, ST ]
Hard to Find!
SORRY, SOLD


Includes


Green Leather Case
Manual

Click for Bigger PIC!
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FC 8/10
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Air Navigation Rule

SALE, SAVE 50%!!!!
SAVE 50%!
Just $5 Ea.

Made in USA
10 inch/4 inch Navigation Rule

(Compass Rose, calibrated scale and course grid)


US military air navigation rule (may be only a part of a larger navigation board) Has two rotating disks (including one 360 degree compass rose) attached to a calibrated scale. Enjoy this item at a bargain price, and please let us know if you understand how to use it correctly! Comes only with a plastic bag cover.

The TPC scale correspond to 8" per statute mile used on Sectional Aeronautical Charts, and the ONC scale 16" per statute mile used on World Aeronautical charts. (These are the US civil aviation names, the military and maybe other countries use the TPC/OPC designations.

The compass rose is normally placed on a starting point on a chart orientated to north, then the scale is rotated to the desired course. The heading is read on the compass rose, and the milage is read on the TPC/ONC scale. If you wish to know more, e-mail Craig Kielhofer who is a pilot and can answer your questions.
86 pcs.


Includes


Bag
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Air Navigation Rule
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Aristo
Aviat
616

ARISTO

Germany


Good case,
$285 Ea.

5.5" Circular Aviation Slide Rule
Constructed with one rotating film disk, and rotating cursor on each side. A very sophisticated and beautiful flight computer for doing altitude, pressure, wind drift, time, temperature, and fuel problems.

The rule gives simultaneous solutions in both metric and US/Imperial units, without being cluttered or hard to interpret, an outstanding mechanical and artistic design. Still in demand today among many pilots, but very hard to find.

Made of 'Aristopal', comes complete with zippered leather pouch. We have had many requests for this rule from all over the world, this set is in very good condtion, except for a few case scuffs. The similar 617 has an additional rotating wind arrow on the back face, not present on these models. This earlier 616 does not have the red reciprocal degrees printed on the rear compass rose, or the wind arrow.Comes with an english manual reprint, but we can supply the german manual if you prefer.




(22 scales on front, Wind scales on rear)
Front - see image
Back - see image
Just 1
more coming


Includes


Rule
Leather Case
Manual Reprint
Aristo 618, CLICK for bigger PIC!
CLICK for BIGGER PIC

Note, does NOT have the red reciprocal compass numbers shown above, otherwise the same.

Aviat 617, CLICK for bigger PIC!
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Aviat 616 Rule
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Aristo
Aviat
618

ARISTO

Germany

Excellent case, $310 Ea.

5.5" Circular Aviation Slide Rule
Constructed with one rotating film disk, and rotating cursor on each side. A very sophisticated and beautiful flight computer for doing altitude, pressure, wind drift, time, temperature, and fuel problems.

The rule gives simultaneous solutions in both metric and US/Imperial units, without being cluttered or hard to interpret, an outstanding mechanical and artistic design. Still in demand today among many pilots, but very hard to find.

Made of 'Aristopal', comes complete with zippered leather pouch. We have had many requests for this rule from all over the world, this are the first 618's we have ever had available for sale, all in excellent condition. The similar 617 has an additional rotating wind arrow on the back face, not present on these models. The earlier 616 does not have the red reciprocal degrees printed on the rear compass rose, or the wind arrow.Comes with an english manual reprint, but we can supply the german manual if you prefer.




(22 scales on front, Wind scales on rear)
Front - see image
Back - see image
SORRY, SOLD


Includes


Rule
Leather Case
Manual Reprint
Aristo 618, CLICK for bigger PIC!
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Aviat 617, CLICK for bigger PIC!
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Aviat 618 Rule
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NEW
COMPUTAR


$10 Ea.

USA

A neat little 4 inch circular rule used to determine camera lens performance/field of view with various different CCD cameras with image areas from 1 inch to 1/4 inch. Plastic front and cursor, cardboard rear section. New rules, no case.

(4 Scales)
Front - Distance, Angle of View, Object dimensions, Focal Length
Back - Directions

26 Left

Includes


Directions on rear
CLICK for bigger PIC
Click for BIGGER PIC of RULE

Computar
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New American Metricaddy

Made in Hong Kong, no small irony there.

$33 Ea.

Yet another strange slide rule artifact from long ago. This pencil cup or desk caddy has two circular slide rule bands that rotate around the cup body, and perform US to metric unit conversions of all kinds.

A surprisingly handy gizmo, these are new in the factory box, all are white with black text (this also exist in black with white text, and red with white text, but this is what we have). Converts temperature, length, weight, area, speed and volume. Impressive computing power for a pencil cup.




(2 Rotating Bands, fixed temp scales)
SORRY, SOLD


Includes


Cup
Box
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White American Metricaddy
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NEW
RCAF
Paratrooper's Rule


$89 Ea.

Japan

Massive 7 inch diameter circular slide rule, with all functions for computing a parachute drop. Very nice rule, was brand new in MIl-packaging, was opened to take the pic only A truly fascinating rule, no case was included.
BRAND NEW, instructions on front face, back is blank.

(4 major scales + 4 minor scales)
Front
- Wind Speed (kts or mph), Height (feet), Drift Distance (yards), Vertical Velocity, T7 index, T10 index, G11 index, G12 index, K
Back
- Blank

SORRY, SOLD


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Rule

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RCAF Para-Rule
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Great Navigation Rule, Trig is degrees, minutes and seconds!

NEW
CONCISE
Model 271


$115 Ea.

Japan

A mid-sized 4 inch pocket circular slide rule, with dual rotating disks, one on each side. Very nice rule, complete with vinyl slip case and factory manual. This is a powerful pocket rule, with trig performance equal to a much larger straight rule.

Navigators, please note, this has trig scales in degrees, minutes and seconds. Plastic body and disks.
BRAND NEW, still sealed in the original bags!, complete with vinyl case and manual, has ad imprint from the Industrial Control Company.

(12 Scales)
Front
- DI, D, [ SI, TI1, TI2, SITI ]
Back
- L, D, [ C, CI, A, K ]

SORRY, SOLD


Includes


CASE
MANUAL
Concise 271, CLICK for bigger PIC!
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Concise 271, CLICK for bigger PIC!
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Concise 271
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Pickett
PICKETT
Model 101C


$169 Ea.

Made in USA

4 Inch Duplex Circular

Pickett's most popular aluminum circular slide rule, with decimal to fraction conversions and additional scales on rear face. Very nice rule, still new in the original blister package, something you just don't see very often! complete with gold embossed black leather case and original Pickett manual.

This is a powerful lightweight pocket rule, with performance equal to a much larger straight rule. Rotating dual cursors on one side (with scales ID's on cursor), single on the reverse. Rule, manual and case are very good condition. Packaged PIC is the actual rule offered, the close ups are another rule for reference, as the rule offered is still sealed.

(15 Scales + conversions)
Front
- C, CI, A, Af, L, Fa, LL2, LL1, DS, DT, M
Back
- C, S, ST, T, Fractional Conversions

SORRY, SOLD


Includes


LEATHER CASE
MANUAL
Pickett 101C, CLICK for bigger PIC!
Pickett 101C, CLICK for bigger PIC!

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Pickett 101C
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CLICK to visit Concise!

Can't find the circular slide rule you want? CONCISE is still operating in Japan, and has a few NEW circular slide rules available via their web site HERE.

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