Francis Barker Magnifying Glass Compass (1906) Bristol Fighter There are also a number

There are also a number of appendices at the rear

In 1820 the company entered into a short term partnership with W

There was a thriving scientific instrument trade in Liverpool at the start of the 19th century

with some minor wear to the page edges

with minor signs of wear and use and some small marks

Francis Barker Magnifying Glass Compass (1906) Bristol Fighter There are also a numberAn 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