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The tabulating machine was an electromechanical machine designed to assist in summarizing information stored on punched cards. Invented by Herman Hollerith , the machine was developed to help process data for the 1890 U.S. Census .
Herman Hollerith (February 29, 1860 – November 17, 1929) was a German-American statistician, inventor, and businessman who developed an electromechanical tabulating machine for punched cards to assist in summarizing information and, later, in accounting.
The Tabulating Machine Company begins its collaboration with Benjamin Wood, Wallace John Eckert and the Statistical Bureau at Columbia University. [35] [8]: 67 The Tabulating Machine Company's 80-column card introduced. Comrie uses punched card machines to calculate the motions of the moon. This project, in which 20,000,000 holes are punched ...
Unit record equipment—machines that process data on punched cards. Employed prior to the widespread use of digital computers. Includes card sorters, tabulating machines and a variety of other machines; Computer punched card reader—a computer input device used to read executable computer programs and data from punched cards under computer ...
Powers-Samas machines detected the holes in punched cards mechanically, unlike IBM equipment where holes in punched cards are detected by electrical circuits. Pins that could drop through round holes in punched cards were connected to linkages and their displacement when a hole was present actuated other parts of the machine to produce the desired results.
Fax Machines. 1843-late 2000s ... The punched-card tabulation system was first put into widespread use during the 1890 United States Census, although inventors had previously tinkered with earlier ...
The 402 could read punched cards at a speed of 80 to 150 cards per minute, depending on process options, while printing data at a speed of up to 100 lines per minute. The built-in line printer used 43 alpha-numerical type bars (left-side) and 45 numerical type bars (right-side, shorter bars) to print a total of 88 positions across a line of a report.
Unlike earlier IBM tabulating machines, which had 80 read brushes at each read station, one for each column, the 407 had 960 brushes at each station, one for each possible hole in a punched card. Cards were held in position during each read cycle and the per digit pulses needed were generated using commutators, one for each column. This allowed ...
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