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Published: 1874
Stuart Davies (joined Avro in 1936 and later to be chief designer of the Avro Vulcan)
This compass was listed as model No
and line drawings
' stamped on the lid
Francis Barker & Son Prismatic Artillery Compass c.1982 Prospecting compass Published: 1874A rare Artillery or Surveyors Prismatic Compass, made in the UK c. 1982 by Francis Barker & Son Ltd of Edenbridge in Kent. With a brass and aluminium case, 102mm duralumin ring card calibrated to half degrees, folding prism and sighting vane, and screw threaded tripod mounting on the base. There is a transit lock which operates to lock the card when the sighting vane is folded, and a manual push button brake. The compass would originally have had a
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