Bisset Addmaster Calculator

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Domestic Accessories: K. Bisset Addmaster Calculator

This half page trader advert from June 1951 shows the predecessor of the pocket calculator. I think I've seen one of these once. You use the "pen" to drag down the roll-over numbers; this causes the next column to increment when appropriate. Fabulous!

Addmaster
Rapid Adding & Subtraction Machines

For book-keeping and stocktaking in shops, offices and factories.

Can be mastered in a few minutes.

Noiseless, easy operation. No keys to punch.

Results appear immediately. Totals always visible.

Cannot make a mistake.

Fully guaranteed

£6 - 6 - 0

Immediate delivery at a price even small businesses can afford from
K. Bisset & Co., Ltd., (Dept. W.) 5, Chelwood Gardens, Kew Gardens, Surrey.