Circular plotting protractor patented by E.R. Zenthon in 1960, aluminium, 2 ft inner diameter, with 8 aluminium scales and perspex centring sheet in fitted wooden box Circular plotting protractor patented by E.R. Zenthon in 1960 1960-1970
Mine surveyor's kit, contains hanging compass, hanging clinometer, protractor, ruler, in fitted leather case, 1701-1800 Mine surveyor's kit, 1701-1800 1701-1800
Two Off Metal Protractors used at the RAE from around 1918. Two Off Metal Protractors Used at the RAE
Brass protractor, 360 degrees brass protractor engraved "W.H. Harling, London. James Tearse". In wooden case. 350mm diam. Brass protractor
Circular reflecting protractor and accessories by by William Cary, London, England,1801-1825 Circular reflecting protractor, British, 1801-1825 1801-1825