Instructions for Staedtler-Mars Model 944-24 Slide Rule

This tan, 36-page booklet is titled: Staedtler-Mars Instructions for Use, Modles [sic] No. 944 24 No. 945 24 Bamboo Slide Rule. The back cover is marked: Printed in Japan.
The instructions define the scales; explain how to multiply and divide; solve problems of proportion; discuss squares and square roots; calculate cubes, cube roots, 3/2 power, and 2/3 power; explain logarithms; provide processes for trigonometric functions; discuss the P or Pythagorean scale; explain the LL scales; and define this rule's five gauge marks. The German firm of Staedtler distributed the rule with which the booklet was received (2009.0019.02). Ricoh, the Japanese company that made the rule, presumably prepared the instructions.
Reference: Paul Ross, "Relay/Ricoh Slide Rules," Journal of the Oughtred Society 9, no. 2 (2000): 64–65.
Currently not on view
Object Name
date made
Ricoh Measuring Instruments
Physical Description
paper (overall material)
overall: 18.3 cm x 12.8 cm x .3 cm; 7 7/32 in x 5 1/32 in x 1/8 in
place made
ID Number
accession number
catalog number
Science & Mathematics
Rule, Calculating
Slide Rules
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Harley Flanders

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