Fixed focus radiation pyrometer, temperature indicator, by Foster Instrument Co. Ltd., Letchworth, England, 1950. Temperature range 700-1400°C, temperature indicator in mahogany case with glass display cover. Photo-Electric Radiation Pyrometer (Temperature Indicator), 1950 1950
Féry radiation optical pyrometer, with thermocouple, temperature indicator; Féry telescope with tripod stand, by The Cambridge Scientific Instrument Company Limited, Cambridge, England, 1910-1914. British patent 5668, 1905, serial no. 17984. Féry Radiation Pyrometer (Temperature Indicator), 1910-1914 1910-1914