Jaco non-recording microphotometer, model 2110, by Jarrell-Ash, Massachusetts, USA., 1960-1965 Jaco non-recording microphotometer 1960-1965
Microphotometer model, H451, made by Adam Hilger Ltd., London, 1946-1948, with galvoscale by Hilger & Watts Ltd, 1952-1955 Microphotometer model 1946-1948; 1952-1955
Microphotometer model GII by Carl Zeiss, Jena, 1960-1965 Microphotometer model GII by Carl Zeiss 1960-1965
