This 1942 ad for a comptometer is just perfect because first of all, I had no idea what a comptometer was (a mechanical calculator, basically) and second, the spec sheet is wonderful: no glare dials, ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This full keyboard key-driven ...

This key-driven, non-printing adding machine is an early example of a Comptometer with a metal case. It has eight columns of plastickeys. The keys in the two rightmost columns, which represent cents, ...

You've got to give Hi Tech Systems some credit for effort: to help their broadcast video controllers stand out at a recent industry expo, they put together the Comptometer, a Steampunk-styled console ...

About this time 130 years ago, Dorr Felt, of Chicago, invented the Comptometer. I learned that while looking up something else. A major method of learning interesting things is to look up something ...

SIR – I can well remember comptometers (Letters, March 31). I worked for London Transport in the 1960s in their office at the old Hillingdon Station. There were about 48 women in eight sections and ...

IN acceding to the editor's request to contribute an article to NATURE upon this instrument, I should like at the outset to express the feeling of curiosity with which any one, familiar with the many ...

If you build a specialized type of hardware which, by design, rarely arouses emotions of physical desire in the general populace, you can see how you might have a bit of a challenge promoting your ...

La calcolatrice meccanica nasce l’11 ottobre 1887. Ma quello è il giorno del brevetto. In realtà in primo prototipo risaliva a tre anni prima. Lo ha raccontato l’inventore in persona, Dorr Eugene Felt ...