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Slide rule for steam power calculations

Bevan's engineer's slide rule

Slide rule for wire spring calculations with one slider

1955

Ganga Ram's patent slide rule, for strains on girders

Engineer's slide rule 15" D R Patent No. 173660 in black card case Mannheim-type scales on front, engineers' constants on back

Engineer's slide rule 15" D R Patent No. 173660 in black card case Mannheim-type scales on front

T.I. slide rule for calculations in connection with tube making

T.I. slide rule

1954