Slide rule, Hayward's Sliding Scale of Equivalents for Weights; size 12" x 1 13/16" x 5/ 16"; one slide, paper scales on wood
Paper slide rules became popular in the early 19th century. This example relates the equivalent weights of various materials such as brick, ivory, lead and mercury.
- Object Number:
- slide rule
- Lt. James F. Godwin
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