Show simple item record

dc.contributor.institutionColorado School of Mines. Information & Technology Solutions
dc.date2018
dc.date.accessioned2018-08-30T20:59:35Z
dc.date.available2018-08-30T20:59:35Z
dc.descriptionDate of manufacture: early 20th century.
dc.description.abstractInvented by Edwin Thacher, an American bridge engineer. Patented in 1881, production of this 20-scale cylindrical slide rule was assumed by Keuffel and Esser Co. of New York by 1897. This unit dates to approximately 1920, serial #3499. The 20 scales provide an effective length of 30 feet with an accuracy of 4 to 5 digits. Scales for square roots are also included.
dc.format.mediumborn digital
dc.format.mediumdigital photographs
dc.identifier.urihttps://hdl.handle.net/11124/172490
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartofMines Techology Museum
dc.subject.lcshComputers
dc.titleThacher's calculating instrument
dc.typeImage


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record