Graphoplex is a French manufacturer of slide rules that also supplied slide rules for
Koh-I-Noor, a European company, still in business, with subsidiaries in the USA.

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P195 Graphoplex - CEFEM - Methane Gas Combustion
Graphoplex - CEFEM - Methane Gas Combustion
Conditions D'Empli De La Règle De Combustion Du Gaz De Lacq
Made in France for Compagnie Francaise Du Methane (CEFEM)
Front Scale
L, A, B3, B2  [ b2, a, b ] B, LL3, LL2, LL1
Back scale e%, O2 %, CO2 % [ CO%(e),  CO%, CO2% ] t°C, t°F, ρ/PCI, ρ/PCS
Instructions - 2.84Mb


S298 Graphoplex 610 Rietz
Graphoplex 610 Rietz
Made in France
Front Scale (Extended Scales)
K, A [ B, CI, C ] D, L
Back: Blank


P167 Graphoplex 612
Graphoplex 612
Made in France
Front Scale (Extended Scales)
13cm // K, A [ B, CI, C ] D, L
Back scale: [S, ST, T]
Back Name: Papeterie Joseph Gibert


S461 Graphoplex 614 Simplex Log Log
Graphoplex 614 Simplex Log Log
Made in France - 1964 - Dual labeled: Left-French, Right-(Conventional)
Front Scale (Extended Scales)
13cm // LL2, LL3, B3(K), B2(A) [ b2(B), L, a(CI), b(C) ] B(D), S cos, S&T, T ctg
Back scale: Blank



P228 Graphoplex 615 System Rietz
Graphoplex 615 System Rietz
Made in France - C1964
Front Scale (Extended Scales)
17cm // K, A [ B, CI, C ] D, L
Back scale: [S, ST, T]
Multi-lined cursor


S462 Graphoplex 620d System Rietz
Graphoplex 620d System Rietz
Made in France - 1962 - French labels
Front Scale (Extended Scales)
27cm // B3(K), B2(A) [ b2(B), L, a(CI), b(C) ] B(D), L
Back scale: [ S Cos, S&T, T ctg ]
Multi-lined cursor


S464 Graphoplex ref. 620 System Rietz
Graphoplex ref. 620 System Rietz
Made in France - 1964 - Conventional Labels
Front Scale (Extended Scales)
27cm // K, A [ B, CI, C ] D, L
Back scale: [SRT, S Cos, T<45°, C]
Multi-lined cursor


S460 Graphoplex 640 System Electric Log Log
Graphoplex 640 System Electric Log Log
Made in France - Dual labeled: Left-French, Right-(Conventional)
Front Scale (Extended Scales)
27cm // L, B3(K), B2(A) [ b2(B), K, a(CI), b(C) ] B(D), LL3, LL2, LL1
Back scale: [ cos, sin, tg, b(C) ]
Back: Electrical Equations and Diagrams
Multi-lined cursor


S463 Graphoplex 640 System Electric Log Log
Graphoplex 640 System Electric Log Log
Made in France - 1958
Front Scale (Extended Scales)
27cm // L, P, A [ B, K, CI, C ] D, LL3, LL2, LL1
Back scale: [ ST, S Cos, T<45°, C]
Multi-lined cursor


ISRM Graphoplex 640 System Electric Log Log
Graphoplex 640 System Electric Log Log
Made in France - 1958
Front Scale (Extended Scales)
27cm // L, P, A [ B, K, CI, C ] D, LL3, LL2, LL1
Back scale: [ ST, S Cos, T<45°, C]
Multi-lined cursor
Donated by David Hecht, Alexandria, VA


P227 Graphoplex 643 Electric Log Log
Graphoplex 643 Electric Log Log
Made in France - 1964 - Dual labeled: Left-French, Right-(Conventional)
Front Scale (Extended Scales)
27cm // L, cos, B3(K), B2(A) [ b2(B), a(CI), b(C) ] B(D), LL3, LL2, LL1
Back scale: [ S&T, S, T, b(C) ]
Back: Blank
Multi-lined cursor


S459 Graphoplex 645 System Commercial
Graphoplex 645 System Commercial
Made in France - 1958
Front Scale (Extended Scales)
27cm // DF [ CF, CI, C ] D, £, s/d, Conversions
Back scale: [ LL3, LL2, LL1, C] Back: Examples of Interest Calculations


REF Graphoplex 650 Electro
Graphoplex 650 Electro
Made in France
Typical of the French, they just had to change the scale tags. Normal in ()
Front Scale (Extended Scales)
13cm // L, B3(K), COSφ, B2(A)Kw [ b2(B)PS, a(CI), b(C) ] B(D), COSφ, Dynamo/Moteur, Volt
Back scale: [S&T, S, T, b(C) ]
Archive - Atsushi Tomozawa Collection


Graphoplex 690A Neperlog Duplex

ISRM 05.02.15.01
Graphoplex 690A Neperlog Duplex
Made in France - 1964
Front Scale (Extended Scales)
LL01, LL02, LL03, DF [ CF, CIF, K, CI C ] D, LL3, LL2, LL1
Back Scale:
LL00, L, T&rt;45°, A [ B, T<45° Cot, SRT, S Cos, C, D, P, DI, LL0
Multi-lined cursor


REF Graphoplex 691A Neperlog - Hyperbolic Duplex

Graphoplex 691A Neperlog - Hyperbolic Duplex
Made in France - 1964
Front Scale (extended)
L, P, A [ B, T<45°, SRT, S, C ] D, Th, Sh1, Sh2
Back Scale:
LL01, LL02, LL03, DF [ CF, CIF, K, CI, C ] D, LL3, LL2, LL1
Multi-lined cursor
Archive - Scan courtesy of Rod Lovette collection


REF Graphoplex 692
Graphoplex 692 Duplex
Made in France
Front Scale
L, P, AI, A, [ B, T (t), S&T, S Cos ] D, DI, K
Back Scale:
LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Archive - Not in Collection - D'Antiques


REF Graphoplex 692b Neperlog
Graphoplex 692b Neperlog - Duplex
Made in France
Front Scale (Extended scales)
LL00, L, T>45°, A [ B, T<45°, SRT, S C ] D, P, DI, LL0
Back Scale:
LL01, LL02, LL03, DF [ CF, CIF, K, CI, C ] D, LL3, LL2, LL1
Archive - Not in Collection - SRTG


ISRM Graphoplex 1600 System Rietz
Graphoplex 1600 System Rietz
Made in France
Front Scale (Extended Scales)
27cm // L, T>45° Cot, A [ B, K, CI, C ] D, S Cos, ST, T<45° Cot
Back: Blank
Donated by David Hecht, Alexandria, VA


S255 Graphoplex 1600 System Rietz
Graphoplex 1600 System Rietz
Made in France
Front Scale (Extended Scales)
27cm // L, T>45° Cot, A [ B, K, CI, C ] D, S Cos, ST, T<45° Cot
Back: Blank


S465 Graphoplex 1614 System Log Log
Graphoplex 1614 System Log Log
Made in France - 1958
Front Scale (Extended Scales)
27cm // LL2, LL3, L, A [ B, K, CI, C ] D, S Cos, ST, T<45° Cot
Back: Blank
Multi-lined cursor


REF Graphoplex 1694 Techni-Math
Graphoplex 1694 Techni-Math
Made in France - 1961
Front Scale (Extended Scales)
27cm // P, K, A, DF [ CF, L, CI, C ] D, S Cos, SRT, T, Cot
Back: Blank
Multi-lined cursor
Archive - Image from Herman van Herwijnen's Catalogue


Graphoplex - CALCRUDE Oil Viscosity Slide Rule
Graphoplex - CALCRUDE Oil Viscosity Slide Rule
Made in France
Front Scale (Extended Scales)
17cm // B3(K), B2(A) [ b2(B), a(CI), b(C) ] B(D), L
Back: Nomograph for determining viscosity of oil at varying temperatures.
Cursor: unusual lens with diagonal hairline to use on back side nomograph.
Archive - Scan provided by Philip Stanley of Worcester, MA


REF Graphoplex_Insert
Graphoplex_Insert
Provided with most slide rules
Calculation aids and instructions for care of slide rule (French)


Koh-i-Noor Hardtmuth a.s. is a Czech manufacturer and one of the world's largest producers and distributors of a full line of pencils, pens, and art supplies.[1] Formed in 1790 by Joseph Hardtmuth of Austria, the company was named after the Koh-i-Noor, a famous Indian diamond. In 1802, they patented the first pencil lead made from a combination of clay and graphite. Koh-i-Noor Hardtmuth eventually became a state-owned company after the Second World War, before once again becoming privately held in 1992 and being bought-out in 1994 by the Gama Group. Prior to 1978 they were a reseller of slide rules made by Graphoplex are also a contract manufacturer of small injection-molded plastic products.

Koh-I-Noor Slide Rules Fabrik Pvt. Ltd in India, (the relationship with Koh-I-Noor Hardtmuth is unknown), is still making special purpose plastic slide rules, including circular computers for aviation.They say on their web site: "We are the pioneer manufacturers of Slide Rules in India! In the year 1949, our company started the production of Slide Rules in 6" & 12" sizes for students, professionals and Army."



Koh-I-Noor 10000 LogLog Duplex Neperlog

ISRM 14.01.10.20
Koh-I-Noor 10000 LogLog Duplex Neperlog
Made in France by Graphoplex - c1961
Note: Same as Graphoplex 690A, except the cursor only has one hairline on both sides.
Front Scale (Extended Scales)
LL01, LL02, LL03, DF [ CF, CIF, K, CI C ] D, LL3, LL2, LL1
Back Scale:
LL00, L, T&rt;45°, A [ B, T<45° Cot, SRT, S Cos, C, D, P, DI, LL0
Gift Of Bill Wehrend Collection, Palo Alto, California.


ISRM Koh-i-noor 10020 Techni-Math
Koh-i-noor 10020 Techni-Math
Made in France - c1961
Front Scale (Extended Scales)
10 in // P, K, A, DF [ CF, L, CI, C ] D, S Cos, SRT, T, Cot
Back: Blank
Multi-lined cursor
Donated by David Hecht, Alexandria, VA

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