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this instrument can also be used to measure distances on any flat surface
and other metal items
machine gun posts
with the mirror automatically held at an angle of 45° by means of a spring and a triangular cam
It had a short pin at one end
Henri Chatelain Rotary Map Measurer & Case c.1910 Seaplanes this instrument can also beAn antique 'HC' (Henri Chatelain) map measurer, dating from the early 20th century. 35mm in diameter, this is an instrument for measuring lengths or distances on maps (Francis Barker made similar instruments to these at around the same time, their version was known as 'The Rotameter'). The dial is calibrated in both inches to the mile and centimeteres to the kilometre. It has a nickel plated brass case, white dial, blued needle, and a screw threaded
