Optical Square Rangefinder c.1905 R. H. Stocken featuring his favourite Sopwith Camel

featuring his favourite Sopwith Camel and a deadly duel with a German ace

There are no makers marks

GALE AND POLDEN LTD

Soon afterwards he was assigned to military service in Egypt

Steward advert at the rear

Optical Square Rangefinder c.1905 R. H. Stocken featuring his favourite Sopwith CamelAn Optical Square rangefinder, dating from c. 1905, complete with its original fitted leather case. Reputed to have been invented by George Adams Senior in the middle of the 18th century, the optical square appeared in the 1795 catalogue of George Adams Junior as 'A small instrument for surveying by right angles'. In the 1907 Negretti & Zambra catalogue it was described as being used 'for fixing a right angle, and in the laying off of offsets'. A