Category:Millionaire calculator (Lowell Observatory)

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The first commercially successful mechanical calculator that could perform a direct multiplication. It was in production from 1893 to 1935 with a total of about five thousand machines manufactured. Lowell Observatory, Flagstaff, Arizona.

Media in category "Millionaire calculator (Lowell Observatory)"

The following 4 files are in this category, out of 4 total.

The Millionaire calculator - Flickr - brewbooks (1).jpg 2,722 × 2,374; 3.08 MB
The Millionaire calculator - Flickr - brewbooks (2).jpg 1,986 × 2,272; 2.06 MB
The Millionaire calculator - Flickr - brewbooks (3).jpg 2,925 × 2,339; 3.42 MB
The Millionaire calculator - Flickr - brewbooks.jpg 2,684 × 2,448; 3.12 MB

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Lowell Observatory