From the early 1900s through the 1960s, mechanical calculators dominated the desktop computing market. These devices were motor-driven, and had movable carriages where results of calculations were displayed by dials. Nearly all keyboards were full - each
From the early 1900s through the 1960s, mechanical calculators dominated the desktop computing market. These devices were motor-driven, and had movable carriages where results of calculations were displayed by dials. Nearly all keyboards were full - each digit that could be entered had its own column of nine keys, 1 thru 9, plus a column-clear key, permitting entry of several digits at once. In these machines, addition and subtraction were performed in a single operation, as on a conventional adding machine, but multiplication and division were accomplished by repeated mechanical additions and subtractions. Bulky calculating machines like this one were essential office tools in the days before the digital revolution. Here a busy accounts clerk refers to a drawerful of files as she punches in figures at the console. No photographer credited, undated.
Size: 3900px × 2872px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No
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