Lab technician with a slide rule, Edgar Allen's steel foundry, Sheffield, South Yorkshire, 1962. Creator: Michael Walters.

Lab technician with a slide rule, Edgar Allen's steel foundry, Sheffield, South Yorkshire, 1962. Creator: Michael Walters.

2-357-613 - Worldwide Photography/Heritage-Images

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Lab technician with a slide rule, Edgar Allen's steel foundry, Sheffield, South Yorkshire, 1962. Before the invention of cheap electronic calculators, slide rules had to be used to work out formulae.

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