Sliding parallel rule:- 3 foot, by William Cary, London, 3" wide when closed, connected by 4 bars, 5 1/8" between centres, mahogany box 3' 1" x 1 1/8" x 3 3/4", painted "Admiralty H.O.32"
- Object Number:
- rules (drawing)
- British Admiralty (Hydrographic Department)
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