Uploaded May 2025 | Updated September 2026, 2 hours ago

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The Britannic calculator is the only pinwheel calculator that was made in England. It was manufactured by Guy's Calculating Machines Ltd in North London from 1919 till the 1950s and maybe even the 1960s.

For more information about this and other machines in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:24 History
2:20 Serial number
2:34 Carriage shift
2:54 Clearing
3:46 Multiplication demo
4:45 Mechanism
6:03 Outro