P. J. Ogle's Improved Protractor

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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.

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Object Details

ID:	ZBA0153
Type:	Protractor
Display location:	Not on display
Creator:	Davis & Son J.
Date made:	circa 1900
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 14 x 303 x 303 mm
Parts:	P. J. Ogle's Improved Protractor Box (ZBA0153.1)