Douglas Protractor

London, Hangar One Aircraft & Exhibits

This square protractor has its origins in marine navigation but has proved equally useful for use with aeronautical charts as nautical ones.

The grid of the protractor corresponds to the grid of the chart enabling measurements of headings and distance to be taken with ease.

Object number	70/I/458
Maker name	The British Engraving & Nameplate Manufacturing Company
Associated with	AM Sir Frederick Beresford (Freddie) Sowrey Royal Air Force

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