I first learned about the Curta from this January 2004 article in Scientific American, by Cliff Stoll. Unfortunately, the article is not available for free. But you can purchase a PDF of the whole Jan ...

This compact cylindrical handheld stepped drum calculating machine has gray metal sides and a black top and operating handle. Eleven slots along the side of the cylinder have plastic red and black ...

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 compact cylindrical handheld ...

I worked with a guy who found one of these at an estate sale in a box of used camera lenses. He didn't know what it was but it looked expensive and said "Made in Germany" so he figured it was worth ...