Battery-free Addiator Or Subtractor
Without battery, without energy… Brilliant mechanism which in its case, fixed on a cast iron base, itself screwed to a board was able to give exact results for decades, in the office where secretaries had to do many operations… I visualize these shorthand typists ticking off the numbers with their stylus before typing the results with their typewriter, on carbon paper in triplicate…. The stylus is replaced by a pencil. Clever system where it was enough to rotate the machine on its desk support to carry out the opposite operations… Addiator and Subtractor rather rare. … around 1920…
145 €
Period: 20th century
Style: Other Style
Condition: Excellent condition
Material: Other
Length: 27cm
Width: 20cm
Height: 13 cm
Reference (ID): 1533198
Availability: In stock
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