Old USA Slide Rule (Beech)

Description

An old wooden slide rule, ‘Made in USA, Lawrence Engineering Service, Wabash Ind, Pat Pend’.

This rule has the nice feature of retaining its original carton.

I’ve just noticed there is a metal and glass/plastic sliding view finder inside the carton which isn’t photographed which slides along the rule.

Length: 8″

Condition: all parts move freely, carton lid missing on one end, not 100% what wood it is made from, please see photos for condition.