Experimental photo-electric radiation pyrometer, temperature indicator. Designed by T. C. Keeley at the Clarendon Laboratory, Oxford, England, 1920-33. Photo-Electric Radiation Pyrometer (Temperature Indicator), 1920-33 1920-1933
Radiation pyrometer (infra-red thermometer) and associated electronic signal processing unit and display unit, by Land Pyrometers, Sheffield, Yorkshire, 1975-78. Contains arsenic trisulphide lens and platinum: rhodium-platinum thermopile. Radiation Pyrometer (Temperature Indicator), 1975-78 1975-1978
