TIM calculating machine, c 1916.

TIM calculating machine, c 1916.
2 8 c m
actual image size: 32cm x 20cm


TIM ('Time is Money') double counting mechanism machine no 13521 with metal cover, made by L Spitz & Co, Berlin. This stepped drum calculator mechanism machine was first introduced in about 1907 and was the first type of four-function calculator. It performs addition, multiplication, division and subtraction, has eight entry setting sliders, nine places in the revolution counter, with 15 places in the results register on each slide.

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© Science Museum / Science & Society Picture Library

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