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Welcome To The Sphere Research Slide Rule Universe !
K+E, Slide Rules from one of America's premier manufacturers!
  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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K+E's 38th catalog frontpiece, CLICK for larger pic!
K+E's 38th catalog frontpiece, CLICK for larger pic!
Mr. Kueffel and Mr. Esser, from recently recovered company archives, CLICK for bigger PIC!
Mr. Wilhelm (William) Keuffel (left)
and Mr. Hermann Esser (right),
CLICK for larger pic!

Archival photograph from recently discovered documents passed from K+E to Azon to Itellicoat at the dissolution of each company. From the 100th anniversary company memorial publication materials.
CLICK to visit
Visit Clark McCoy's K+E Catalog Site.

K+E 100th Anniversary Publication (1967)
CLICK to download the zipped 100year book, 20mb file!
CLICK to download the entire scanned 100 year anniversary publication.


There are 41 pages (including cover letter, and front/back book covers). Everything is in one ZIP archive (all high res-JPG files), approximately 20mb in total size.

Thanks to Ray Brohinsky, here's the 100 year book files compressed and turned into a smaller (13mb) PDF document:
CLICK to download the PDFCLICK to Download
100 Year Book in PDF
Format
K+E company timeline, CLICK to get full sized JPG file.
Page 36, showing K+E's corporate timeline versus major world events. CLICK for full size JPG file.
The day the slide rules arrived...
CLICK to see the full sized image (JPG)
CLICK to see the full sized image!
slide rule designs...
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CLICK to see the full sized image!


The Slide Rule Universe
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K+E 4153 setCLICK to see
An amazing tour with K+E from 1940.




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Learn How to Operate a Slide Rule with a 1928 K+E Lesson


KE logo Keuffel & Esser Co. factories were based in Hoboken, New Jersey (USA), with offices in New York, Chicago, St. Louis, San Francisco, Detroit, and Montreal. Started in 1867, slide rules were only a very small part of K+E's product offering, which included everything from drafting paper to survey instruments and drafting aids. K+E held patents for a wide range of slide rule features, including improved cursor indicators, functions and scales, and the adjustable body mechanism. Caught by the huge market shift created by electronic calculators, CAD systems and laser surveying systems, which displaced all of their strong markets, K+E shrank dramatically after 1972.


KE logo Slide rules were never very profitable for K+E, and production and most inventory was gone by the mid-70's. K+E even sold some TI manufactured calculators for a brief period trying to capitalize on their existing customer base and industry knowledge. The final assets of K+E, mainly involving paper products, were sold to AZON in 1987, after several painful internal re-organizations. AZON also acquired the remaining assets of Hughes-Owens in 1988, and the POST Company in 1994, relating to it's principal business, which is drafting and reproduction paper and film. Only these paper products survived the shakeout in all these related businesses. Dietzgen still exists today, but like AZON, is mainly in the paper business, and itself was taken over by Intellicoat.


KE logo Most K+E slide rules were originally implemented in mahogany, with celluloid white scale overlays, engraved scales and glass cursors. People (especially on eBay) often mistakenly think the scales on older K+E rules are made of Ivory, but they are not, they are made of white celluloid. Later slide rules like the 4097 were made from Xylonite, and then (4181, Deci-lon and Doric series) from "Ivorite", a smooth, white, long wearing plastic (Cycolac/ABS). Xylonite was quite brittle, and not an ideal body material, Ivorite was much better, more rugged, whiter in color, and has very good sliding/lubricating properties. K+E rule scales were normally engraved (sorry, "engine divided") for long wearing life, and often filled in different colors to accent inverse scales. A few inexpensive rules like the plain wood body 4058, have an impressed/printed scale. Glass magnifying cursor indicators were available, and increased the settability and resolution of virtually any rule, often making a 10" rule the effective equivalent of a 20" version. Reference data for the K+E magnifiers is shown towards the end of the table.


KE logo Notes: It is somewhat unclear what the difference is between K+E slide rule numbers that have an "N" at the front, and those that do not. Catalogs do not clarify this, but according to Ed Chamberlain, it reflects subtle design differences in a scale or mechanical construction detail, with the N designation being the NEW version of the rule. This is only a partial clue, as many K+E rules, such as the venerable 4053 Mannheim rule, existed in many subtle variations of body, cursor and scale designs, but were not differentiated by any part number change (a highly confusing situation). This rule and many others were then finally re-named with a 68-series number confusing matters even worse for collectors. Note that PIckett (a competitor) also added N to the front of rule numbers to indcate new physical designs.

Click to see bigger view of K+E types4081-3
Log Log Duplex
Deci-Trig

68-1100
Deci-Lon



4053-3
Polyphase

4088-3
Duplex Polyphase






KE logo"4000" series data here is from the 1936 K+E catalog and some later numbers from live examples, later "4100" series numbers and 68-rules are taken from live examples and a 1964 K+E brochure. The dash number on these "4000" series rules indicates the size of the rule (based on the same scale pattern), and is the SCALE LENGTH, not the over-all size of the rule itself. There was a brief period (50's) where K+E used a different numbering scheme beginning 90 (9081 for example) for DORIC brand Ivorite body rules but then changed back to 4100 series numbers. 68-rules have no dash to indicate length, but had different ordering part numbers for different cases (with or without pocket clip or other case styles), although the slide rule number itself was not changed, raising confusion to new levels for all involved.


KE logo Dating K+E slide rules is a complicated task, as serial numbers were recycled three times at K+E. Based on external clues from the body and cursor (although caution is needed there, as it may have been replaced), as well as case and manual details, and any copyright or patent dates, it is possible to place the rule within one of the three probable cycles. The copyright or patent date IS NOT the date of manufacture, and may be decades earlier than the real production date. Note that evidence from Deci-lon rules shows at least one additional cycle after the ones shown below, plus some random numbers after 1964. Considerable work was done to calculate these serial number cycles by Wayne Feely and Ed Chamberlain, and Ed's quick chart is provided here with permission to help you date your rules. Click on the chart to bring up a larger version! Note that Joe Soper identified many end of manufacture rules that had out of sequence parts, so rules made in the last year or so of production may have numbers that do not fit this chart.


Ed's dating chart, CLICK for bigger PIC!
Click for bigger Chart!

K+E
4000 Series Dash Numbers

-1 = 5" scales
-2 = 8" scales
-3 =10" scales
-5 =20" scales
CLICK to see the New 68- Series Numbers Conversion Chart
Click to see the 68-xxxx Series
Number Conversion Chart
K+E
Get Michael O'Leary's K+E model cross reference file HERE. Contains model info, equivalent numbers, and cursor/magnifier part numbers
K+E
Click to DOWNLOAD the K+E Cross-Reference

Note: this is an Excel File!



K&E
Model Number
Slide Rule Type Size,
Core Material
Scales
Features
IMAGE
LINKS
(Back to Return)
4012 Thatcher's Calculating Instrument 18" cylinder

Wood

20 angular segments

No indicator, A, B, C
CLICKSee also this page

Wood box

Thatcher
Click for Bigger Pic!

Click for Another Pic!

4013 Thatcher's Calculating Instrument 18" cylinder

Wood

20 angular segments

3 inch reading glass, A, B, C
CLICKSee also this page

Wood box

4017 Sperry's Pocket Calculator 2 1/8" diameter, watch style

Metal, Glass

4 scales

duplex indicator

unknown

4031S Mannheim 5"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

leather case

N4031
shows extra cursor
N4035S Mannheim 8"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

leather case

N4041 Mannheim 10"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

N4041
N4041S Mannheim 10"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

leather case

N4041-4 views
N4041
4045 Mannheim 16"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

4045S Mannheim 16"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

leather case

4051 Mannheim 20"

Wood

A, [ B, C, ] D
[ S, L. T ] on slide reverse, side rulers,

improved glass indicator,

4051
Partial with 4055 Below

4051
Rest of the 4051 Rule

4051S Mannheim 20"

Wood

A, [ B, C, ] D, rulers,

improved glass indicator,

leather case

4053-2S Mannheim Polyphase 8"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

leather case

4053-3 Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D
K (edge)
[ S, L, T ]

frameless plate glass indicator,

Flap case
Early production (no serial number), from 1920's or earlier

Click here for Bigger Pic
Click here for Bigger Pic


Click here for Bigger Pic
Click here for Other Side


Click here for Bigger Pic
Click here for Side Scale
(N)4053-3 Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

N4053-3

Click for bigger pic of magnifier rule

Click for bigger pic of magnifier rule
4053-3S Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

sewn leather case

4053-3 Ivorite
4053-3 Ivorite
N4053-3
4053-3
4053-3 w/case
4053-3F Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

finer divisions

4053-3FS Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

finer divisions,

leather case

(N)4053-5 Mannheim Polyphase 20"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

N4053-5 CLICK for bigger PIC!
CLICK for BIGGER PIC


N4053-5 CLICK for bigger PIC!
CLICK for BIGGER PIC!


N4053-5 CLICK for bigger PIC!
CLICK for BACK


N4053-5 CLICK for bigger PIC!
CLICK for BIGGER PIC


N4053-5 CLICK for bigger PIC!
CLICK for BACK

4053-5
4053-5S Mannheim Polyphase 20"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

leather case

Click for bigger pic!
4053-5 w/case
4055 Mannheim Favorite 10"

Wood

A, [ B, C, ] D
[ S, L, T ]
K+E 4055, CLICK for bigger pic!
Click here for Bigger Pic

Click here for Other Side
4056 Mannheim Favorite 10"

Wood

A, [ B, C, ] D CLICK for bigger PIC!
4058 Mannheim Beginner's 10"

Wood

A, [ B, C, ] D,
plain wood, xylonite indicator
CLICK for bigger PIC!
4058C Mannheim Beginner's 10"

Wood

A, [ B, C, ] D,
plain wood,

frameless (wood sided) indicator

Click here for Bigger Pic
Click here for Bigger Pic


Click here for Bigger Pic
Click here for Other Side
4058W Mannheim Beginner's 10"

Wood

A, [ B, C, ] D,
white finish,

plain frame indicator

4058W
4070-3 Polyphase Duplex Trig 10"

Wood

K, A, [ B, T, ST, S, ] D, DI &

DF, [ CF, CIF, CI, C, ] D, L

Improved glass indicator.

Trig scales degrees, minutes.

4070-3S Polyphase Duplex Trig 10"

Wood

K, A, [ B, T, ST, S, ] D, DI &

DF, [ CF, CIF, CI, C, ] D, L

Improved glass indicator.

Trig scales degrees, minutes. Sewed leather case.

Trig in minutes/seconds

4070-3, CLICK for BIGGER PIC
CLICK for BIGGER PIC

CLICK for OTHER SIDE

4071-3 Polyphase Duplex DeciTrig 10"

Wood

K, A, [ B, T, ST, S, ] D, DI &

DF, [ CF, CIF, CI, C, ] D, L

Improved glass indicator.

Trig scales degrees, decimals.

4071-3S Polyphase Duplex DeciTrig 10"

Wood

K, A, [ B, T, ST, S, ] D, DI &

DF, [ CF, CIF, CI, C, ] D, L

Improved glass indicator.

Trig scales degrees, decimals. Sewed leather case

4080-3 Log Log Duplex 10"

Wood

LL0, LL00, A, [ B, T, ST, S, ] D, DI, K &

L, LL1, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales inches, seconds, degrees.
Several scale variations produced.

CLICK for bigger PIC!

CLICK for bigger PIC!

CLICK for bigger PIC!

TRIG in Minutes/Seconds!

Click for bigger PIC!
CLICK for bigger PIC


CLICK for bigger PIC
CLICK for bigger PIC
4080-5 Log Log Duplex 20"

Wood

LL0, LL00, A, [ B, T, ST, S, ] D, DI, K &

L, LL1, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales inches, seconds, degrees.

4081-3 Log Log Duplex Decitrig
©1947
10"

Wood

LL0, L, K, A, [ B, T, SRT (or ST), S, ] D, DI, LL1

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales decimal degrees. Many cosmetic variations.

Click for bigger pic!
Click for other side!

4081-3
4081-3S Log Log Duplex Decitrig
©1947
10"

Wood

LL0, L, K, A, [ B, T, SRT (or ST), S, ] D, DI, LL1

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales decimal degrees. Many cosmetic variations.
Orange sewn leather case

K+E 4081-3, Click for bigger PIC!
CLICK for bigger PIC

4081-5 Log Log Duplex Decitrig
©1947
20"

Wood

LL0, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales decimal degrees.

4083-3 Hyperbolic Log Log Duplex 10"

Wood

Sh1, Sh2, Th, A, [ B, T, ST, S, ] D, DI, LL01, LL1

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Hyperbolic Sine and Tangent Trig scales, used in the power industry.

HYPERBOLIC SCALES

CLICK for bigger PIC

4083-3 Other Side
N4083-3S Hyperbolic Log Log Duplex 10"

Wood

L, LL01, LL1, A, [ B, T, ST, S, ] D, Th, Sh1, Sh2,

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

Improved glass indicator.

Hyperbolic Sine and Tangent Trig scales (numerous scale layout variations), used in the power industry. Orange sewn leather case

HYPERBOLIC SCALES

CLICK for bigger PIC
CLICK for bigger PIC


CLICK for bigger PIC
CLICK for bigger PIC
4088-1S Polyphase Duplex 5"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Frameless glass indicator, leather case

4088-2S Polyphase Duplex 8"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Improved glass indicator, leather case

4088-3 Polyphase Duplex 10"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Improved glass indicator

CLICK for BIGGER PIC
CLICK for BIGGER PIC

CLICK for BIGGER PIC
CLICK for OTHER SIDE

4088-3S Polyphase Duplex 10"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Improved glass indicator,

leather case

Magnifier and fitted case!

CLICK for BIGGER PICCLICK for BIGGER PIC
CLICK for BIGGER PIC

CLICK for OTHER SIDE

4088-5 Polyphase Duplex 20"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Improved glass indicator

4088-5S Polyphase Duplex 20"

Wood

K, A, [ B, S, T, CI, ] D, L &

DF, [ CF, CIF, C, ] D

Improved glass indicator,

leather case

4090-3 Log Log Trig Duplex 10"

Wood

LL0, A, [ B, K, CI, ] T, S1, S2

L, LL1, DF, [ CF, CIF, C, ] D, LL3, LL2

Improved glass indicator.

Trig scales degrees and minutes.

4090-3S Log Log Trig Duplex 10"

Wood

LL0, A, [ B, K, CI, ] T, S1, S2 &

L, LL1, DF, [ CF, CIF, C, ] D, LL3, LL2

Improved glass indicator,

leather case.

Trig scales degrees and minutes.

4091-3 Log Log Deci-Trig Duplex 10"

Wood

LL0, A, [ B, K, CI, ] T, S1, S2 &

L, LL1, DF, [ CF, CIF, C, ] D, LL3, LL2

Improved glass indicator,.

Trig scales in degrees and decimals of degrees.

4091-3S Log Log Deci-Trig Duplex 10"

Wood

LL0, A, [ B, K, CI, ] T, S1, S2

L, LL1, DF, [ CF, CIF, C, ] D, LL3, LL2

Improved glass indicator,

leather case.

Trig scales in degrees and decimals of degrees.

4092-3 Log Log Duplex 10"

Wood

LL0, A, [ B, S, T, C, ] LL3, LL2, LL1 &

K, DF, [ CF, CIF, C, ] D, L

Improved glass indicator.

4092-3
4092-3
4092-3S Log Log Duplex 10"

Wood

LL0, A, [ B, S, T, C, ] LL3, LL2, LL1 &

K, DF, [ CF, CIF, C, ] D, L

Improved glass indicator,

leather case.

N4092-5 Log Log Duplex 20"

Wood

LL0, A, [ B, S, T, C, ] LL3, LL2, LL1 &

K, DF, [ CF, CIF, C, ] D, L

Improved glass indicator.

N4092-5S Log Log Duplex 20"

Wood

LL0, A, [ B, S, T, C, ] LL3, LL2, LL1 &

K, DF, [ CF, CIF, C, ] D, L

Improved glass indicator,

leather case.

4093-3 Log Log Vector Duplex 10"

Wood

Sh1, Sh2, Th, [ SI1, SI2, TI, ] D, S, T &

L, LL0, DF, [ CF, B, CI, C, D, ] LL3, LL2

Improved glass indicator,

circular & hyperbolic functions.

4093-3, CLICK for bigger PIC!
CLICK for BIGGER PIC

CLICK for OTHER SIDE

4093-3S Log Log Vector Duplex 10"

Wood

Sh1, Sh2, Th, [ SI1, SI2, TI, D, ] S, T &

L, LL0, DF, [ CF, B, CI, C, ] D, LL3, LL2

Improved glass indicator,

circular & hyperbolic functions,

leather case.

Hyperbolic Scales!

4093-3, CLICK for bigger PIC!
CLICK for BIGGER PIC

CLICK for OTHER SIDE

4093-5 Log Log Vector Duplex 20"

Wood

Sh1, Sh2, Th, [ SI1, SI2, TI, ] D, S, T &

L, LL0, DF, [ CF, B, CI, C, ] D, LL3, LL2

Improved glass indicator,

circular & hyperbolic functions.

4093-5S Log Log Vector Duplex 20"

Wood

Sh1, Sh2, Th, [ SI1, SI2, TI, ] D, S, T &

L, LL0, DF, [ CF, B, CI, C, ] D, LL3, LL2

Improved glass indicator,

circular & hyperbolic functions,

leather case.

4094 Mannheim Merchant's 10"

Wood

DF, [ CF, CI, C, ] D, rulers,

improved glass indicator

4094, Click for bigger PIC!
Click here for Bigger Pic

Click here for Other Side
4095-1S Merchant's Duplex 5"

Wood

DF, [ CF, C, ] D &

[ CI, ] D

frameless glass indicator,

leather case

4095-3 Merchant's Duplex 10"

Wood

DF, [ CF, C, ] D

[ CI, ] D

improved glass indicator.

4095-3S Merchant's Duplex 10"

Wood

DF, [ CF, C, ] D &

[ CI, ] D

improved glass indicator,

leather case.

N4096 Mannheim Desk Slide Rule 20"

Wood

DF, [CF, CI, C, ] D

improved glass indicator,

metal stands, leatherette covered hard case.

4096
4097B Mannheim

Ever-There

5"

Xylonite

DF, [ CF, CI, C, ] D &

back rulers,

improved glass indicator,

very light weight,

leather sheath.

4097C Mannheim

Ever-There

5"

Xylonite

A, [ B, CI, C, ] D, K &

[ S, L, T ] on reversible slide,

back rulers,

improved glass indicator,

very light weight,

leather sheath.

4098A
Large View
4097D Mannheim

Ever-There

5"

Xylonite

A, DF, [ CF, CI, C, ] D, K &

B, [ S, L, T ] on reversible slide, back cm/inch rulers,

improved glass indicator,

very light weight,

leather sheath.

4097D
4098 Mannheim

Pocket Slide Rule

5"

Xylonite

A, [ B, C, ] D &

[ S, L, T ] on reverse of slide, back rulers, frameless xylonite indicator, very light weight, leather sheath.

CLICK for bigger PIC, 4098A
N4100 Mannheim

Stadia

10"

Wood

R, H, HC, V, A

side ruler, A & B scales on reverse of slide,

improved glass indicator,

for survey work

N4100S Mannheim

Stadia

10"

Wood

R, H, HC, V, A

side ruler, A & B scales on reverse of slide,

improved glass indicator,

leather case,

for survey work

N4101 Mannheim

Stadia

20"

Wood

R, H, HC, V, A

side ruler, A & B scales on reverse of slide,

improved glass indicator

for survey work.

N4101S Mannheim

Stadia

20"

Wood

R, H, HC, V, A

side ruler, A & B scales on reverse of slide,

improved glass indicator,

leather case,

for survey work.

N4102 Surveyor's Duplex 20"

Wood

D, Sind, Coslah, C, Tan, Tan1, Az &

Vert1, A, [ B, CI, C, ] D, Vert2

improved glass indicator,

for surveying.

N4102S Surveyor's Duplex 20"

Wood

D, Sind, Coslah, C, Tan, Tan1, Az &

Vert1, A, [ B, CI, C, ] D, Vert2

improved glass indicator,

leather case, for surveying.

N4133S Mannheim Roylance Electrical 8"

Wood

A, [ B, CI, C, ] D, K &

side ruler, side wire gauge,

improved glass cursor, multiple hairlines, special rule marks, leather case.

N4135S Power Computing Duplex 5"

Wood

A, [ B, CI, C, ] D

P, R, W, D, for steam, gas and oil engines, frameless glass indicator, leather sheath.

4139 Duplex Cooke Radio Rule 10"

Wood

LC, A, [ B, T, ST, S, ] D, DI &

L, DF, [ CF, CIF, CI, C, ] D, 2pi

improved glass cursor, special electronics scales, hard case.

4139 Back
4139 Front
4150-1 Mannheim

Pocket

5"

Ivorite

DF, [ CF, CI, C, ] D, L

blank on reversible slide

improved plastic indicator,

very light weight,

leather sheath.

4153-1 Mannheim

Pocket

5"

Ivorite

A, [ B, CI, C, ] D, K

[ S, L, T ] on reversible slide

improved plastic indicator,

very light weight,

leather sheath.

Click for bigger 4153 pic
4160 Chemist's Duplex 10"

Wood

CI, [ D, Bought, ] Given &

C, [ D, Bought, ] Given

improved glass cursor,

for chemical analysis.

4160S Chemist's Duplex 10"

Wood

CI, [ D, Sought ] Given &

C, [ D, Bought, ] Given

improved glass cursor,

leather case,

for chemical analysis.

4161-1 Mannheim

Pocket

5"

Ivorite

K, DF, [ CF, L, CI, C, ] D, A

[ T, ST, S, ] C on reversible slide

improved plastic indicator,

very light weight,

leather sheath.

Set box and care booklet
CLICK for bigger PIC!
CLICK for BIGGER PIC

CLICK for bigger PIC!
CLICK for BIGGER PIC

CLICK for BIGGER PIC
CLICK for BIGGER PIC

CLICK for BIGGER PIC
CLICK for BIGGER PIC

4161-3 Mannheim

Slide Rule

10"

Ivorite

K, DF, [ CF, L, CI, C, ] D, A &

[ T, ST, S, ] C on reversible slide

improved plastic indicator,

very light weight,

leatherette sheath.

CLICK for BIGGER PIC
CLICK for BIGGER PIC

CLICK for BIGGER PIC
CLICK for BIGGER PIC

4168

also 68-1555

Duplex
Doric
5"

Ivorite

DF, [ CF, CI, C, D, ] L &

K, A, [ B, ST, S, ] D, T

improved glass indicator,

leather sheath.

Click for bigger pic!
Click for other side of 4168-1
4175 Kurtz Psychometric 10"

Wood

Special air conditioning scales, improved glass indicator, formulas on reverse.
4181-1 Log Log Duplex 5"

Ivorite

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2 &

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved cursor, leather case. See also 68-1287 for later release of the same rule. Note that several cosmetic variations exist, with all black, and black and red scales.

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4181-1 Front

4181-1 Back

4181-3 Log Log Duplex 10"

Ivorite

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved cursor, leather case. See also 68-1251 for later release of the same rule.

4181-3, CLICK for bigger PIC!

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4181-3

4181-3
Large View

4185A Magnifying Cursor Glass for 4031
4185B Magnifying Cursor Glass for 4035-4088, 4094, 4095-3, 4096, 4100, 4101, 4133, 4165
4185C Magnifying Cursor Glass for 4088-4093, 4095-5, N4096, 4102, 4142-4175
68-1100 Deci-Lon
©1947, 1961
10"

Ivorite

Sq1, Sq2, DF, [ CF, CIF, L, CI, C, ] D, Ln0, Ln1, Ln2, Ln3 &

Ln-3, Ln-2, Ln-1, Ln-0, A, [ B, T, SRT, S, C, ] D, DI, K

Improved plastic cursor, leather case.

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68-1100
Front View


68-1100
Back View


Click for bigger view of Green case deci-lon

-no number- Deci-Lon
©1947, 1961
10"

Ivorite

Sq1, Sq2, DF, [ CF, CIF, L, CI, C, ] D, Ln0, Ln1, Ln2, Ln3 &

Ln-3, Ln-2, Ln-1, Ln-0, A, [ B, T, SRT, S, C, ] D, DI, K

Improved plastic cursor, leather case. Final Deci-lon production, no model number or grip lines on slide.

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68-1130 Deci-Lon
©1947, 1961
5"

Ivorite

Sq1, Sq2, DF, [ CF, CIF, L, CI, C, ] D, Ln0, Ln1, Ln2, Ln3 &

Ln-3, Ln-2, Ln-1, Ln-0, A, [ B, T, SRT, S, C, ] D, DI, K

Improved plastic cursor, pocket clip leather case. Pocket sized version of 68-1100 full size rule.

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68-1130
68-1130
68-1130
68-1130 Drawing
68-1210 Log Log Duplex Deci-Trig
10"

Wood

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2 &

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved cursor, leather case. Appears to be a re-numbered 4081-3 rule.

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68-1215 Log Log Duplex Deci-Trig
10"

Wood

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2 &

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved cursor, leather case. Appears to be a re-numbered 4081-3 rule, complete with sewn leather case, in a set, the rule is still numbered 68-1210.

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68-1251 Log Log Duplex Deci-Trig
10"

Ivorite

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2 &

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved cursor, leather case. Seems to be newly numbered 4181-3 rule in every respect.

K+E 68-1251 Click for bigger PIC!
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68-1287

68-1261 with leather clip case

Duplex Deci-Trig
Jetlog Jr.
5"

Ivorite

LL02, LL03, DF, [ CF, CIF, CI, C, ] D, LL3, LL2 &

LL01, L, K, A, [ B, T, SRT, S, ] D, DI, LL1

Improved unbreakable cursor, leather case. Seems to be newly numbered 4181-1 rule in every respect.

68-1400

Analon

Analon engineering constant rule 10"

Ivorite

V2, V1/2, A, [ B, U1/2, U-1, C, ] D, V, V-1

Improved unbreakable cursor, leather case, special manual.

Completely unique rule and scale design, with pysical constants on the scales.

68-1400 front view
68-1400 rear view
68-1400 box/manual view
68-1497

4070-3 with decimal trig scales

Duplex

Polyphase Duplex Deci-trig

5"

Wood

Front - DF, [ CF, CIF, CI, C, ] D, L
Back - K, A, [ B, T, SRT, S, ] D, DI

improved unbreakable indicator,

leather sheath.

Wood Edged Rule

69-1497, CLICK for BIGGER PIC
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68-1555

also 4168
68-1550 with leather clip case

Duplex

Polyphase Duplex Deci-trig

5"

Ivorite

DF, [ CF, CI, C, ] D, L &

K, A, [ B, ST, S, ] D, T

improved unbreakable indicator,

leather sheath.

68-1555
68-1565 GP12
10"

Ivorite

Sq1, Sq2, DF, [ CF, T, SRT, S, CI, C, ] D, A, K &

cm, inch rules, number to log converter, inch/cm converter. Conversion factors
Senior Student slide rule

plastic cursor, black and red scales, green plastic body supports, black leather case. Very nice but seldom seen late production rule.

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68-1586


68-1581 with leather clip case

Simplex

Modern Polyphase

5"

Ivorite

K, DF, [ CF, L, CI, C, ] D, A &

[ T, ST, S, ] C

improved unbreakable indicator,

leather sheath.

68-1586
68-1607
Same as 4053-5
Mannheim Polyphase 20"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

wood back.

green leather flap case

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68-1607, CLICK for bigger PIC!
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68-1608
Same as 4053-5
Mannheim Polyphase 20"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

wood back.

green leather flap case


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68-1617
Same as 4053-3S
Mannheim Polyphase 10"

Wood

inch A, [ B, CI, C, ] D, K, cm
[ S, L, T ]

improved glass indicator,

late production, Xylonite back.

sewn leather case

68-1617, CLICK for bigger pic!
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68-1648


68-1643 with leather clip case

Simplex

Polyphase

5"

Ivorite

A, [ B, CI, C, ] D, K &

[ S, L, T ]

improved unbreakable indicator,

leather sheath.

68-1648
68-1749 Mannheim Desk Slide Rule 20"

Wood

DF, [ CF, CI, C, ] D

improved glass indicator,

metal stands, leatherette covered hard case.

4096
68-1791


68-1786 with leather clip case

Simplex

Merchants

5"

Ivorite

DF, [ CF, CI, C, ] D, L

improved unbreakable indicator,

leather sheath.

68-1791
68-1892 K12 Prep
10"

PVC

K, A, [ B, S, CI, T, C, ] D, L
student slide rule

plastic cursor, green scales, green plastic body supports, plastic pouch.

68-1892
Mannheim rule--- mannheim
Mannheim rule--- mannheim
Old Pocket Mannheim rule---shows extra magnifying cursor added. pocket mannheim
Duplex rule--- duplex
Duplex rule--- duplex
Duplex rule--- duplex

K& E Pocket Rule
Return to the Slide Rule Universe !RETURN

Image credits: most of these images are from public postings to Ebay with no copyright restriction noted. I will be adding the exact references over time, so please be patient. If you are the originator of any image showm please advise, and we will add your specific credit and an email link (if desired). If you are the original owner, and do not want your image shown, please advsie, and we will remove it.

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