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David Sundstrand (1880-1930) was a Swedish-born American inventor of the 10-key adding machine, 10-key calculator keyboard, a 10-keypad now used on computer keyboards, and a co-founder of Sundstrand Corporation. Sundstrand's 1914 adding machine had the first now common place keyboard for 10-key calculators and numeric keypads.
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 ...
To add, for example, the amounts of 30.72 and 4.49 (which, in adding machine terms, on a decimal adding machine is 3,072 plus 449 "decimal units"), the following process took place: Press the 3 key in the column fourth from the right (multiples of one thousand), the 7 key in the column second from right (multiples of ten) and the 2 key in the ...
A numeric keypad, number pad, numpad, or ten key, [1] [2] [3] is the palm-sized, usually-17-key section of a standard computer keyboard, usually on the far right. It provides calculator -style efficiency for entering numbers.
Although Dalton introduced in 1902 first 10-key printing adding (two operations, the other being subtraction) machine, these features were not present in computing (four operations) machines for many decades. Facit-T (1932) was the first 10-key computing machine sold in large numbers.
The ten-key notation input method first became popular with accountants' paper tape adding machines. It generally makes the assumption that entered numbers are being summed, although other operations are supported. Each number entered is followed by its sign (+/−), and a running total is kept.
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The first key-activated mechanical calculators and many cash registers used "parallel" keys with one column of 0 to 9 for each position the machine could use. A smaller, 10-key input first started on the Standard Adding Machine in 1901. [9] The calculator had the digit keys arranged in one row, with zero on the left, and 9 on the right.