• British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
  • British Artillery Prismatic Compass by Francis Barker & Son.
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Tommies Militaria and Collectables

British Artillery Prismatic Compass by Francis Barker & Son.

British Artillery Prismatic Compass by Francis Barker & Son.

£120.00 GBP
£120.00 GBP
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Product Description

A 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 lid, but this is missing. It comes with its original fittted leather case and shoulder strap. This compass was listed as model No. 1201 in the 1982 Francis Barker catalogue. Other versions were available with optional filters and azimuth mirror.

This compass design originated in the second half of the 19th century, and was a development of the Schmalcalder Patent types of the early 1800's. In 1861 W. F. Stanley patented a number of improvements in the use of aluminium in the manufacture of mathematical and scientific instruments, and he was one of the first to use this type of cutaway aluminium card. Stanley's Surveying and Levelling Instruments (1895) included a description of this type of compass, and it was listed in many scientific instrument catalogues, including the J. H. Steward Military Instruments Catalogue (1901), the W. F. Stanley Catalogue (1912), and the Francis Barker catalogues of 1909 and 1926.