Kelvin & James White Ltd, Barker 'RGS' Compass c.1904 Troughton & Simms and the Francis Barker catalogues

and the Francis Barker catalogues of 1909 and 1926

at 56 Hatton Garden

published by the manufacturer

continuing to supply the East India Company until 1838

Kelvin & James White Ltd, Barker 'RGS' Compass c.1904 Troughton & Simms and the Francis Barker cataloguesA rare variant of the Francis Barker & Son RGS type prismatic compass, dating from c. 1904. Although there are no maker's marks, this is a well known Barker design which the company supplied to several prominent scientific instrument retailers, including Negretti & Zambra, London, Kelvin & James White, Glasgow, and Davidson & Regenstreif, Cairo. The compass featured in the 1909 Negretti & Zambra catalogue, where it was described as 'Prismatic Compass,