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 ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The titles Include Ropp's New ...

HOLLAND — With the sun shining and the temperatures in the mid-60s, it felt like a perfect afternoon for the Felt Mansion Estate, 6597 138th Ave., in Holland. The drive through the countryside on a ...

Dorr Felt, in some respects, was the Steve Jobs of his generation. Much as Jobs' Apple and Macintosh revolutionized how computers were used, Felt's comptometer changed how businesses kept their ...

This full-keyboard non-printing adding machine represents the successful adoption of mechanical aids to computation by American scientists. It was one of several computing devices owned by the ...

Q: I was wondering what happened to the Allentown Comptometer School that was directly across from Hess’s Department Store? I don’t even know what a Comptometer was, but I remember the school. A: The ...