BGS Geoheritage – images from the collections
Showing posts with label
compasses
.
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Showing posts with label
compasses
.
Show all posts
Tuesday, 22 July 2014
Letter from Admiralty to Geological Museum, 1917
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BGS Archive Ref: GSM/DR/St/A/20 This letter relates to materials suitable for making compasses for aeroplanes. Such compasses would ...
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