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Scientific Item Detail
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Item #

A3869

1905 Locke Adder Calculator w Adv

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V020616

Price $

475

This rare adder was made in 1901 by the C. E. Locke Mfg. Co. in Kensett, Iowa, U.S.A., and marked as such on the right side.  The left side says The Locke Adder, Patented Dec 24, 1901; Jan 3, 1905.   Included is original advertisement (Adv size is 2.5” x 2”).  Machine is pictured and described in the book “Antique Office Machines” by Thomas Russo.  Invented and patented by C. E. Locke of Wisconsin in December 1901 with Patent Number 689,680.  It was a finger sliding bar type adder with color-coding to readily tell dollars and cents.  The Russo book states “Availability is Scarce and value of each is over $ 800.00”.   It measures 10 3/4" long, 4" wide and about 1/2" thick.  There are 9 rows of moveable numbers, and on the left side there are marking points that go from 1 cent to 1 million dollars, on the right side the markings delineate units up 100 million.  Machine is made of stamped tin painted black.  Instrument is in good condition and bottom felt showing slight wear.  Internet research shows a portion of provenance notes to show “Its results are always correct, its price within the reach of all. It is a necessity to any up-to-date businessman or accountant. C. E. Locke Mfg. Co., Kensett, Iowa, U.S.A., then shows a picture of a man putting it in his inside coat pocket”.  Note – No instruction book is included, but above provenance notes are accurate.   This rare treasure will highlight any collection of old calculators.

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