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Description: | Circular protractor with one straight edge, and two moveable rings (one with clamps) which rotate against the inner and outer scales. The inside ring measures 90� four times. The middle ring has North, South, East and West plates screwed on to it. Outer ring has four lots of 90�. Made of white metal - either electrum or nickel, with engraved scales. Made by J DAVIS & SON, LONDON & DERBY, Diameter = 291mm. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | protractors | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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