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with minor signs of wear and use and some small marks
and a mother of pearl dial with a triangular luminous North marker
There was a thriving scientific instrument trade in Liverpool at the start of the 19th century
with some minor wear to the page edges
Barnes Wallis went on to work on the design of the R
Francis Barker Magnifying Glass Compass (1906) Bristol Fighter with minor signs of wearAn early example of the Francis Barker 'Prospecting compass, dating from 1906. It was a version of Barker's 'Glow Needle' design, which was patented in June 1906 (Patent No. 12777). The Patent number and the date '1906' are stamped on the base. The compass has a raised graduated ring, luminous painted flat needle, agate cap, side stop, and transit lock. The lid is fitted with a powerful magnifying lens, described in Barker's 1909 catalogue as being
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