Bisset Exactus Calculator

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Domestic Accessories: K. Bisset Exactus Calculator

This half page trader advert from September 1950 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!

An Adding Machine for £6.6.0

Invaluable to every business and profession - for book-keeping and stocktaking in shops, offices and factories - the EXACTUS adding machine adds and subtracts to £999,999.19.11¾d.

Simple to operate

Fully Guaranteed

All-metal precision made

Total appears as you work

Desk model with new Clear-Vue face £6 - 6 - 0, carriage paid.

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