An adding machine is a class of mechanical calculator usually built for bookkeeping calculations, and the earliest adding machines were often designed to read figures in a particular currency. Adding machines were common office equipment across developed countries for most of the twentieth century. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
SignificanceAdding machines became standard office equipment across developed countries for most of the twentieth century, before being phased out by electronic calculators in the 1970s and personal computers from the mid-1980s. 1 Sources
1. Adding machine (Wikipedia)
lead section, sentence 5
Blaise Pascal and Wilhelm Schickard were the two original inventors of the mechanical calculator in 1642.
lead section, sentence 3
Adding machines were ubiquitous office equipment in developed countries for most of the twentieth century.
- In Group: Early and Historical Computing Machines, lead states an adding machine is a class of mechanical calculator specialized for bookkeeping calculations
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