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Adding machine for the Australian pound c.1910, note the complement numbering, and the columns set up for shillings and pence. An adding machine is a class of mechanical calculator, usually specialized for bookkeeping calculations. In the United States, the earliest adding machines were usually built to read in dollars and cents.
The comptometer, introduced in 1887, was the first machine to use a keyboard that consisted of columns of nine keys (from 1 to 9) for each digit. The Dalton adding machine, manufactured in 1902, was the first to have a 10 key keyboard. [9] Electric motors were used on some mechanical calculators from 1901. [10]
Dorr Eugene Felt (March 18, 1862 – August 7, 1930) was an American inventor and industrialist who was known for having invented the Comptometer, [1] an early computing device, and the Comptograph, the first printing adding machine.
It was the first printing-adding machine design to use individualized type impression which made its printed output very legible. The first comptograph was sold to the Merchants & Manufacturers National Bank of Pittsburgh, PA. in December 1889. It was the first sale of a recording-adding machine ever. This machine is now on display at the ...
the first calculator to have a controlled carry mechanism that allowed for an effective propagation of multiple carries [32] the first calculator to be used in an office (his father's to compute taxes) the first calculator commercialized (with around twenty machines built) [5] the first calculator to be patented (royal privilege of 1649) [33]
The adding machine range began with the basic, hand-cranked Class 1 which was only capable of adding. [citation needed] [2] The design included some revolutionary features, foremost of which was the dashpot which governed the speed at which the operating lever could be pulled so allowing the mechanism to operate consistently correctly. [3]
The Standard Adding Machine Company released the first 10-key adding machine in about 1900. The inventor, William Hopkins, filed his first patent on October 4, 1892. The 10 keys were set on a single row. 1902 United States: First model of Dalton adding machine is built. [49]
Women and Men Working in Office at Standard Adding Machine Company, 3701 Forest Park Boulevard, May 1910. Standard Adding Machine Company was founded in the early 1890s (first records are from 1892) [2] [3] [4] in Illinois and was the first company to (successfully) [5] release a 10-key adding machine. The machine was a breakthrough for its ...