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Last Updated: October 20, 2026
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In this video I show how to use a Neill, founder and MD of CIS, has this wonderful piece of old tech in his home office! This is a The Sumlock was made by Bell Punch in the UK from 1940 till the late 60s, but these two were made in the early 1950s. They are ... In this video we take a look at my favorite calculator the How to do fast multiplication and division on a ho invented the adding machine? In the autumn of 1884 a young Chicago machinist, Dorr Felt, built one in a macaroni box, with ... Before electronic computers and calculators, there were mechanical calculating machines. The A visual explanation of how the In this video we're fixing a piece of retrotech from the 1960s - a
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