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- Q3547325 subject Q5636975.
- Q3547325 subject Q6811912.
- Q3547325 subject Q8098178.
- Q3547325 abstract "Template:ForAn adding machine was 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. Adding machines were ubiquitous office equipment until they were phased out in favor of calculators in the 1970s and by personal computers beginning in about 1985. The older adding machines were rarely seen in American office settings by the year 2000.Blaise Pascal and Wilhelm Schickard were the two original inventors of the mechanical calculator in 1642; For Pascal this was an adding machine that could perform additions and subtractions directly and multiplication and divisions by repetitions, whilst Schickard's machine, invented several decades earlier was less functionally efficient but was supported by a mechanised form of multiplication tables. These two were followed by a string of inventors and inventions leading to those of Thomas de Colmar who launched the mechanical calculator industry in 1851 when he released his simplified arithmometer (it took him thirty years to refine his machine, patented in 1820, into a simpler and more reliable form). However, they didn't gain widespread use until Dorr E. Felt started manufacturing his comptometer (1887) and Burroughs started the commercialization of differently conceived adding machines (1892).".
- Q3547325 thumbnail Mechanical_calculating_machine.jpg?width=300.
- Q3547325 wikiPageWikiLink Q1066523.
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- Q3547325 wikiPageWikiLink Q5636975.
- Q3547325 wikiPageWikiLink Q572421.
- Q3547325 wikiPageWikiLink Q57403.
- Q3547325 wikiPageWikiLink Q66241.
- Q3547325 wikiPageWikiLink Q669329.
- Q3547325 wikiPageWikiLink Q6811912.
- Q3547325 wikiPageWikiLink Q770441.
- Q3547325 wikiPageWikiLink Q784567.
- Q3547325 wikiPageWikiLink Q8098178.
- Q3547325 wikiPageWikiLink Q873501.
- Q3547325 comment "Template:ForAn adding machine was 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. Adding machines were ubiquitous office equipment until they were phased out in favor of calculators in the 1970s and by personal computers beginning in about 1985.".
- Q3547325 label "Adding machine".
- Q3547325 depiction Mechanical_calculating_machine.jpg.