Sterling Currency Calculators
This example is serial number P10230 S. It was made in Strathleven, Scotland (with "parts made in U.S. America") in the 1950s/60s.
Note the nine "1" keys in the 10's of shillings column - 19 is the maximum number of shillings - and the extra "10" and "11" pence keys.
290 mm wide, 340 mm long, 225 mm high (11.5" x 13.5" x 9"), 9 Kg (20 lbs.).
The print head during the printing operation.
There is a print bar for each column of keys. Each print bar has all the digits in order. When the handle is pulled forwards to print the number keyed in, and add it to the accumulator, the print bars rise to different heights to impact the keyed digits on the paper.
In 1986 Burroughs Corporation merged with Sperry Corporation to become Unisys.
The add-lister type of machine is much slower in use than the "Comptometer" type machine since the handle has to be pulled forward to add (or subtract each number enetered - though you have a printed record of all calculations.
© Text & photographs copyright Nigel Tout 2000-2023 except where noted otherwise.