Protractor, semi-circular, by Jones

Made:: London

Protractor, semi-circular, by Jones, 6" circle, divided on brass, numbered both ways from 0 degrees to 180 degrees, subdivided to 1/2 degrees, reading by vernier to 1 minute; arm projects about 3" beyondcircle, mahogany case 10" x 4 3/4" x 3/4", marked "H.O.R."

Details

Category:: Mathematics

Object Number:: 1911-246

type:: drawing instruments and semi-circular protractors

credit:: British Admiralty (Hydrographic Department)

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