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1898 to 1909
with general signs of use
An almost identical Troughton & Simms compass can be seen in the collection of the Science Museum in London
25mm depth
ordnance department
The Theory and Practice of Aerial Sighting (1919) RFC 1898 to 1909THE THEORY AND PRACTICE OF AERIAL SIGHTING F. S. Publication 118 AIR MINISTRY, London, 1919 A mans flying ability may be perfect; he may be able to control the machine like no one else on earth, but if he goes into a fight and risks his life to get into the right position for a good shot, and, upon arriving there, cannot hit the mark he is useless Major W. A. Bishop V. C., D. S. O., M. C. The Theory and Practice of Aerial Sighting is a very rare RAF
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