Geometry / model / instrument, surveying / instrument, mathemati

Slide rule (ordinary form) in brown leather case, part of a collection of geometrical models and surveying and mathematical instruments, used to calculate the weight of a cubic foot of a variety of metals, wood, cement and pure water and the ultimate strength in lbs, maker unknown, late 19th - e. 20th Century

Geometry / model / instrument, surveying / instrument, mathemati

Box sextant, part of a collection of geometrical models and surveying and mathematical instruments