the slide rule Englsh, c.1910, nickel plated with glass cover, paper scale printed 'Fowlers Magnum Patent Long Scale Calculator Fowler & Co Manchester', (crown winder that rotates the scales sometimes does not locate)11.8cm diameter; with a Stanley compass, case dated 1906, prismatic, with sights, mirror and two filters,lacquered brass case marked with broad arrow, in leather case with strap, compass diameter 8.9cm