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An almost identical Troughton & Simms compass can be seen in the collection of the Science Museum in London
with general signs of use
uk/article/30241/Search-the-collections
but this type of round wooden compass was only made in limited numbers and is much more uncommon
and the Singer’s Patent compasses of the 1860’s
The Theory and Practice of Aerial Sighting (1919) RFC An almost identical Troughton &THE 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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