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It had a short pin at one end
Dimensions : 52mm diameter (75mm including loop)
Later years saw paddling trips along the south coast of England (1870)
this instrument can also be used to measure distances on any flat surface
and other metal items
Henri Chatelain Rotary Map Measurer & Case c.1910 Seaplanes It had a short pinAn 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
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