Image: Thacher's Calculating Instrument

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Description: Thacher's Calculating Instrument, patented in 1881, can be thought of as a series of conventional slide rules mounted around the periphery of a cylinder. There are 20 pairs of scales forming the outer framework of the cylinder. Within this framework there is a solid cylinder that can be both rotated and moved longitudinally within the framework of scales. The open framework itself can also be rotated as a unit. Thacher's Calculating Instrument was mounted on a mahogany base and produced by the Keuffel and Esser Company of New York.
Title: Thacher's Calculating Instrument
Credit: Own work
Author: Gotanero
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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West Washington Street Bridge (Muncie, Indiana)

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