A sturdy rectangular calculating instrument with a removable metal cover. Removing the cover reveals an angled faceplate consisting of several parts. At the top of…
A rectangular wooden box with a lockable lid opens to reveal a brass panel with a number of dials and sliding pegs. In the lower…
This object is a dark green mechanical calculator in a wooden box. The calculator consists of a bank of slots with sliding mechanisms that allow…
2012.lej.54.1: A black, cylindrical case contains a small, black, cylindrical instrument, with a handle at its top. It resembles a pepper grinder. On its sides,…
Wooden slide rule with metal ends.
A 10″ slide rule made of celluloid on mahogany with a grooved frame and a metal-framed glass cursor. The stops are made of stainless steel.…
A wooden ruler.
A table containing various conversions. Its front is dedicated to converting between various units of energy and power. Its back contains conversions for various units…
A ruler with a triangular cross section, made of wood with white surfaces.
Two “star quality” rulers with triangular cross sections.