Large photogrammetric plotting machine by Barr and Stroud, c. 1928 Large photogrammetric plotting machine by Barr and Stroud 1928
Tilt finder by Barr and Stroud, for use with plotter 1932-464 and Thompson plotter 1930-248, c. 1927 Tilt finder by Barr and Stroud 1927
Barr and Stroud range-finder, 4ft 6ins base, used aboard ship on Antarctic Expeditions, 1902-1904 and 1910-1913 Optical range-finder, British, 1902-1904 1900