Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Two Fold Slide Rules
Christie / Engineer
James Christie & Son
28 cm

Notes: Old Arched hinged unusual engineers rule that concentrates on measurement rather than calculation. The scales are a strange mixture of old-style international imperial and metric measurements. The slide rule is equally unusual comprising of two identical double radius scales but they begin and end at approximately 1.5. One of the outer edge scales suggest a possible connection to the steel trade.

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