Patent Model - Improvement in Counting Machines

Maker and role
U. Turner, Patentee
Production date
Jul 02 1867
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Object detail

20 1/2 x 17 x 1 1/2" (52.1 x 43.2 x 3.8cm)
Turner's patent was intended to "facilitate the adding up of long columns of figures, by noting the tens as they successively accrue, so that they may be dropped, as fast as they occur, from the mental operation, the instrument alone noting them, so that in adding a column of any length, the mind never combines more than 18, and at the foot, the unit figure alone is in the mind, and you must look at the dial to ascertain the number of tens. The mind discards the tens as they occur, and only uses the excess." (Patent Number 66,269)
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