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, ...

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, ...

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 ...

Nothing sends a stock up faster than the news that a company has a glamorous new electronic device—especially if the news is exaggerated. Example: two little-known, money-losing companies.

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 ...

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 ...

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 ...