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Keuffel and Esser Sperry Pocket Calculator
Named collection: Keuffel & Esser Company Collection
Object type: slide rule
Maker: Keuffel & Esser Co.
Place made: United States, New York
Materials: metal; glass
Measurements: 1/2 in x 3 in x 2 in
[This item] is an early Sperry Calculator which K&E went on to sell as Model 4016 or 4017 in about 1906 depending on the gearing of the hands -- which is not obvious by simply looking at the calculator. By 1909 it had been replaced by the later model of Sperry/K&E calculator with concentric nuts. It is the natural successor to Calculigraphe calculators they sold first. Note it is also not known who made any of the Sperry or K&E devices, or where they were made. A conversation with Mr Gerd Keuffel, great grand-son of the founder, during the IM 2011 meeting elicited the opinion that K&E were unlikely to have made any of these devices themselves, the founders were well known to have visited Europe on a regular basis looking for items that K&E could market. Peter Hopp 11.10.2011
Keuffel & Esser Company Slide Rule Collection Donated by InteliCoat Technologies