Exotic Slide Rules
  Oversize 20" Rules, Accessories & Magnifiers, Unusual Applications
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Sphere Research Coporation, CLICK to visit!
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Sphere Research Corporation
3394 Sunnyside Rd.
West Kelowna, BC, Canada V1Z 2V4
Phone: +1 (250) 769-1834


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

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EXOTIC SLIDE RULES
and even some other things...


KC-135A Load Adjuster

Otis King Model K, CLICK for bigger PIC!

Abacus

20 inch rules


go right to the catalog! Skip the INTRO, Go RIGHT to the CATALOG!

* 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, 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 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 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

We have some additional 20 inch rules available, PLEASE EMAIL us for details if you are interested.

SLIDE RULE
INFO / SCALES
QTY.
PRICE
FOXBORO
FLOW RULE

Actual rule set, CLICK for bigger PIC!
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Click for bigger PIC!
Click for Back View!


USA Japan
12.5"/10" Special Purpose Full Size Slide Rule
This NEW, special late production Foxboro flow rule is used to calculate flow parameters and rates for liquids, steam or gas. This is the version custom made for Foxboro by Hemmi of Japan, and has red, blue and black engraved and filled scales.

Pipe schedules are color coded for easy operation. The unusual design uses many dedicated scales sets on both sides, and includes the fitted factory box and manual, and gold embossed leather case, all in MINT condition!. It's a rule you will really enjoy in your collection, or on the job doing steam or hydraulic pipe fitting.

We have a second new rule and case, no box or manual, $245

Just 1
NEW

$295

Foxboro Flow Rule
Like this rule?

CLICK TO ORDER

SLIDE RULE
INFO / SCALES
QTY.
PRICE

Faber Castell
4/22 Disponent
4/54 Darmstadt
4/87 Rietz
4/98 Elektro
20 inch Slide Rules

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Germany
NEW, MINT 20 Inch/50cm Slide Rule Sets
4/22 Disponent (Finance)
FC 4/22 Disponent, CLICK for bigger PIC!
4/22 Disponent, CLICK for bigger PIC!
(10 Scales, 1 Ruler, Gauge Marks)
Front - cm, / Gauge Mks, DF, [ CF, CI, C, ] D, L, | sh/d, Pounds
Reverse - [ LL1, LL2 ]
5-Line Cursor + Accessories
4/54 Darmstadt
4/54 Darmstadt, CLICK for bigger PIC!
4/54 Darmstadt, CLICK for bigger PIC!
(13 Scales, 1 Ruler)
Front - cm, L, / K, A, [ B, CI, C, ] D, P, | S, T
Reverse - [ LL1, LL2, LL3 ]
5-Line Cursor + Accessories
4/87 Rietz
4/87 Rietz, CLICK for bigger PIC!
4/87 Rietz, CLICK for bigger PIC!
(10 Scales, 2 Rulers and conversion instructions)
Front - Inch / K, A, [ B, CI, C, ] D, L, | cm
Reverse - [ sin/cos, sin/tg, tg ] Instructions
5-Line Cursor
4/98 Elektro
4/98 Elektro, CLICK for bigger PIC!
4/98 Elektro, CLICK for bigger PIC!
(11 Scales, 1 Ruler)
Front - cm / LL2, A, [ B, CI, C, ] D, LL3, | K
Reverse - [ S, L, T ]
5-Line Cursor + Accessories

New, mint condition 20" rule sets, with original 2-part green fiberboard box/case and original factory english manuals.

We have one of each type, take one or all four! We see good 20 inch sets only rarely, here are four exceptionally nice rules made by Faber Castell, all in amazing mint ondition.

Model info inside Boby areaEach rule model number is inside the rule body (move the slide out to see it).
Every rule has a cm edge scale,
plus a variety of functions on the bottom edge.

The accessories inside the bags include a supplemental ruler, adjustment guide and tiny screw adjuster. -RH
1 of each Set
$325
FC 4/22 Disponent

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$325
FC 4/54 Darmstadt

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CLICK TO ORDER
$325
FC 4/87 Rietz

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$325
FC 4/98 Elektro

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SLIDE RULE
INFO / SCALES
QTY.
PRICE

Hemmi/Sun

Early 257
Chemical Engineering
10" Duplex Rule

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CLICK for OTHER SIDE

Japan

This is one of the most fascinating and highly requested rules from Hemmi, and is the first version of this rule, with a slightly different scale set than the later 257L (257 has no K scale, and a different pressure scale arrangement, a very rare animal!

This rule solves a wide range of chemical and pressure/temperature problems.

12" / 10" Advanced Chemical Engineering Duplex Slide Rule
NEW, powerful classic Bamboo duplex rules, in our brand NEW Sphere Case, NOT Leather as shown! Complete with an original HEMMI MANUAL, very hard to find. These rules were not seen in North America often (quite unfortunate), but provide a wealth of specialized chemical calculations, including atomic weight, temperature/pressure, factor conversion and a full function rule on the reverse. Very impressive and unique rule, with self-documenting special purpose scales.

We only have one of these rare early rules available, so don't miss your chance!

We have checked and cleaned the rule set, and installed a new cursor, it looks fantastic!



(Unusual 23 Scales !!)
Front - L, A, DF, [ CF, CIF, CI, C, ] D, LL3, LL2, LL1
Back - Ch a-m, Ch n-z, M1, [ M2, degrees F, degrees C, degrees K, F(t), ] Kg/cm2, mmHg, in Hg vac, tw

CLICK to see! Want to know more about our
NEW SPHERE CASES?
JUST CLICK HERE!
Just 1 Set


Includes:


Sphere Case
Manual
$245


Hemmi 257
Like this rule?

*CLICK TO ORDER

SLIDE RULE
INFO / SCALES
QTY.
PRICE

Hemmi/Sun

Early 257L
Chemical Engineering
10" Duplex Rule

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Japan

This is a very late production version of one of Hemmi's highly requested Chemical Rules, with the added K scale. This rule solves a wide range of chemical and pressure/temperature problems.
12" / 10" Advanced Chemical Engineering Duplex Slide Rule
NEW, powerful classic Bamboo duplex rules, in Hemmi's final version (plastic) leatherette case. Complete with a HEMMI MANUAL, very hard to find. These rules were not seen in North America often (quite unfortunate), but provide a wealth of specialized chemical calculations, including atomic weight, temperature/pressure, factor conversion and a full function rule on the reverse. Very impressive and unique rule, with self-documenting special purpose scales.

We only have one of these rare final rules available, so don't miss your chance!

New and in mint condition, it looks fantastic!



(Unusual 24 Scales !!) RH
Front - L, K, A, DF, [ CF, CIF, CI, C, ] D, LL3, LL2, LL1
Back - Ch a-m, Ch n-z, M1, [ M2, degrees F, degrees C, degrees K, LM, ] mmHg, Kg/cm2, in Hg vac, tw
Just 1 Set


Includes:


Factory Case
Manual
$275


Hemmi 257L
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*CLICK TO ORDER

SLIDE RULE
INFO / SCALES
QTY.
PRICE

Hemmi/Sun

266
Electronic Engineering
10" Duplex Rules

Hemmi 266, CLICK for bigger PIC!
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Hemmi 266, CLICK for bigger PIC!
CLICK for OTHER SIDE

Japan

This is the
most requested
rule from Hemmi.

Solves everything from parallel resistance to resonant frequency

12" / 10" Advanced Electronic Engineering Duplex Slide Rule
NIB, Powerful and classic Bamboo duplex rule, in 2-part plastic case, with a factory box, complete with an original HEMMI MANUAL. These rules were not seen in North America very often (REALLY too bad), but provide a wealth of specialized electronic calculations, including dB, Xc, XL, Frequency, impedance, wavelength, and a full function rule on the reverse. Very impressive rule, with self-documenting scales and quite uncommon. Dual marked scales for some functions. We get asked for this rule constantly, but have had real trouble finding them. If you are an electronics guy like me, this is your big chance! We only have one set.

This set is the best one I have ever seen, it looks like it was just made.   (RH)



(Unusual 24/26 Scales !!)
Front - LL3', LL2', LL1', LL2, A, [ B, BI, CI, C, ] D, dB/L, S, T
Back - XL, Xc, F, T1, [ T2, L, Cf, Cz, ] L, Z, fo, lambda
SORRY, SOLD


Includes:


2-Part Plastic Case
Box
Factory Manual
$395


Hemmi 266
Like this rule?

*CLICK TO ORDER

SLIDE RULE
INFO / SCALES
QTY.
PRICE
Otis King Model K
Cylindrical Slide Rule

Otis King Model K, CLICK for bigger PIC!
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Otis King Model K, CLICK for bigger PIC!
Click for Bigger PIC!


Very Good used Otis King Model K Boxed Set!
Otis King Bix Otis King Model K boxed set. This has scales 423 and 414
A wonderful set with original factory box (serial number V3940), made in England. This is the unique cylindrical rule with telescoping scales, complete with the original black storage box. Everything is in very good condition. This rule has the equivalent of a 66 inch scale, with resulting incredible resolution! We see very few of these sets. The box shows the faint imprint of an owner's name -Devonport-, visible on the pic at left, a faint name -G E Swift- is visible on the black body, but is hard to see on the rule, and can't really be photographed. Want to know more about these? Look HERE and HERE for on line tutorials on these rules. You can also get a zipped manual reprint HERE from Greg.

(2 scales)
Scale 423
Scale 414
For multiplication, division, proportion, percentages, foreign exchange.

SORRY, SOLD
$195

Otis King
Model K
Like this set?

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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Small Abacus
10 Inch


CLICK for bigger PIC!
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Made in China

13 rod Chinese Abacus
light finished frame construction, with black beads. 10 inches wide, 4.5 inches tall. Brass reinforced corners, not as well finished as the Peony abacus we had earlier, but a good starter abacus for students.
FOR INSTRUCTIONS, visit the excellent Abacus page at Ryerson:

CLICK to visit Ryerson to learn more about the abacus...
13 Rods
5/2 bead style
Last 6 Sets
Save $4
Save $4
$26

Small Abacus
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SLIDE RULE
INFO / SCALES
QTY.
PRICE


N4133S
8 Inch Roylance Electrical Rule


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USA
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8" Roylance Electrical Slide Rule
K+E N4133S.
This is one of the very few catalog special purpose rules made by K+E. This was designed to be both a general purpose rule, and a replacement for wire and electrical tables for working electrical engineers.

This is a short format 8 inch mahogany rule (usually designated with a -2 suffix), and is one of the very few K+E rules with a multi-line cursor for area of a circle calculations. The top edge is an inch ruler, the back has conversion factors, plus a sight window for the rear slide scales. The set includes a very good condition, unmarked sewn leather case. The rule has special gauge marks, and bottom edge and interior scales for electrical wire gauge calculations. Serial number is 528207.


(11 Scales and inch ruler)
Front - inch/ A, [ B, CI, C, ] D, K | wire gauge
Reverse - conversion factors [ S, L, T ]
Inside - [ wire gauge ]
SORRY, SOLD


Includes:


Brown Sewn Leather Case
$225


K+E N4133S 8 inch rule set
Like this rule?

*CLICK TO ORDER

SLIDE RULE
INFO / SCALES
QTY.
PRICE
KC-135A
Load Adjuster Rule

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CLICK for Back Details

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CLICK for Inside Body Scales


USA

12.5"/10" Special Purpose Full Size Slide Rule
Another excellent design from Cox and Stevens (the makers of the famous Foxboro Flow Rule), for loading and operating the KC-135A aircraft. It also has scales inside the body, and seating chart on the reverse, with abbreviated operating instructions on the scale areas.

A very unique and visually appealing rule, it has a perfect cursor, rule and case are in excellent condition. The body appears to be made of black plastic like nylon or delrin, with laminated scales in white, yellow, black and red.

(18 Major Scales, numerous minor scales, internal chart and rear diagram)
Front - see pictures
Reverse - see pictures

SORRY, SOLD
$225

KC-135A Load Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
R6D-1/C-118A
Load Adjuster Rule

Load Adjuster, Click for Bigger PIC!
Click for Bigger PIC!

CLICK for Slide Reverse/Body Scales

CLICK for Back
USA

12.5"/10" Special Purpose Full Size Slide Rule
Another excellent design from Cox and Stevens (the makers of the famous Foxboro Flow Rule), for loading and operating the C-118A. It also has scales inside the body, and seating chart on the reverse, with abbreviated operating instructions on the scale areas.

A very unique and visually appealing rule, it has a perfect cursor, is in excellent condtion, but has no case. The body appears to be made of black plastic like nylon or delrin, with laminated scales in white, black and red.

(14 Major Scales, internal chart and rear diagram)
Front - Loading Range, [ Gross Weight, Fuel, Passenger, Troops, Cargo, Litters,] Index
Slide Reverse - [ Basic Weight/Moment A, B, C ]

SORRY, SOLD
$155

C-118A Load Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Keating
Pipe Size Computer

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USA
Keating Pipe Size Computer

8" gold anodized aluminum rule, with 4 special scales for pipe sizing.

Excellent condition, a very unique rule in both purpose and appearance. Instructions are on the rear of the rule, and show both operation and special factors for pipe bends and T-connections. Includes gold embossed brown vinyl slip case.

(4 Scales and instructions)
Front - Pressure Drop, [ Length, Diameter, ] Gas
Reverse - Equivalents, Instructions
SORRY, SOLD
$65

Keating Pipe Size Computer
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Novotni
Weight Slide Rule

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Novotni Manual (Folded inside box)
USA
Novotni Weight Slide Rule

13.5" paper and wood rule, in original box with manual.

Very good condition, used to quickly calculate the weight of common metal shapes and sizes, very useful in metal fabricating work, and costing.

The Novotni rule is one of the best examples of a fixed purpose slide rule, optimized for industry. This is an early rule from the maker. Some early owners of this rule had their names written inside the rule body, SEE DETAILS HERE.

Just 1
$195

Novotni Weight Slide Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
US Army
105mm Howitzer Rules

Howitzer Rules, CLICK for bigger PIC!
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USA
3ea. 16 Inch Rules!

16" Wood rules with plastic cursors, complete with the green nylon carrying bag. Perfect for that home defence 105mm Howitzer you bought last week, allows easy set up of loads, angles and target distances. Numerous marks, pen markings, some cosmetic blemishes, clearly these have been used for real.

SORRY, SOLD
$125

105mm Howitzer Rules
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
GAEBEL
Steel Composition Rule

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USA
16 Inch Rule!

16" Stainless steel over mahogany core typesetting/composition rule. Used for graphical layout, has reduction/enlargement functions, type sizing, and multiple rulers on both sides. Also works as a regular slide rule, with A/B/C scales. Extensive documentation on rear side.

All markings are deep etched into the stainless surface, a very attractive and useful rule for the art prep table.

SORRY, SOLD
$165

Geable Steel Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Shure Brothers
REACTANCE SLIDE RULE

SHURE, CLICK for bigger PIC!
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USA
8" Special Purpose Reactance Slide Rule
The most famous Perrygraf ever made, complete with manual and slip case. Both sides are shown in the pic, only 1 rule is supplied, cardboard construction. Excellent condition. Solves for inductive and capacitive reactance, D, Q and resonant frequency, an incredibly useful tool! Self documenting on both sides, with full instructions. We get requests for this all the time, just got some more in. They may be different colors than show, depending on printing date.

(18 Scales, and instructions)
Front/Rear - See pics for scale details

Just 1
$49

Shure Reactance Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Vickers
.303 Machine Gun
Mk. IV
Slide Rule
For MKVIII Ammo

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Made in UK

8" Heavy Aluminum (0ver synthetic body) Slide Rule for the Vickers .303 Mk. IV Machine Gune.
An amazing leftover from WW2, copyright 1944, by the R. E. Co, Ltd.

An extemely complex rule, with two side body scales for map reading, two double sided slides, and data on both faces, plus a calibrated 24 inch cord.

Just what you need for that quite afternoon out on the shooting range. Converts 'meteres' to yards, factors in wind, elevation, range and something mysterious called clock rays, to determine the set up of the machine gun. In very good condition!

(9 Scales, two map rulers, data charts and calibrated string)
Front - See pics!

Reverse - See Pics!

Just 1
$225

Vickers Machine Gun Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
Jones Metabolism
Equipment Co.

Human Metabolic Rate Rule

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Made IN USA

11" Heavy Aluminum and Steel Slide Rule for calculating Human Metabolic rate information
A very bizarre rule with 2 steel slides in a heavy gold anodized aluminum sleeve, it works with body weights from 40 to 400 pounds. Very good condition, includes simple cloth carrying case (some stains and marks).

It has individual scale settings for men and women, and factors in age, sex, time to consume a stadard liter of oxygen, height and gives percent deviation of standard metabolic rate. I think.....

(5 Scales)
Front - rate, time, weight, height, age, sex

Reverse - Directions

Just 1
$195

Jones Metabolic Rule
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SLIDE RULE
INFO / SCALES
QTY.
PRICE
FOXBORO 2183
VALVE SIZING RULE

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USA
12.5"/10" Special Purpose Pocket Size Slide Rule
One of Foxboro's later special rules for hydraulic work, it's used to calculate flow parameters and valves for liquids, steam or gas. Excellent condition. Like other Foxboro rules, this plastic body rule uses even the body cavity for scales. Comes with a gold embossed, black leatherette case. Self documenting on the rear, with full instructions.

(15 Scales, and rear instructions)
Front - See pic for scale details
Slide Reverse - [ additional scales ]
Back - Instructions

Last 1
$95

Foxboro Valve Rule
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