Hawthorn’s Civil Engineering Rule by Sampson & Aston Birmingham
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Hawthorn’s Civil Engineering Rule by Sampson & Aston Birmingham

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An example of an early English Civil engineering rule with numerous scales and markings. Marked improved and arranged by Robert Hawthorn civil engineer Newcastle Tyne. Made by the firm of Sampson Aston Birmingham. German silver trim, four fold, dual slides, edge scales, and easily an evenings reading.

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