Platinum electrical resistance thermometer (pyrometer), laboratory pattern, with porcelain tube and fitted with glass tube, by The Cambridge Scientific Instrument Company Limited, Cambridge, England, 1910-14. Platinum Electrical Resistance Thermometer, 1910-14 1910-1914
Platinum rhodium thermocouple with one fireclay sheath, by Cambridge Instrument Company Limited, London, England, 1925-29. Platinum Rhodium Thermocouple, 1925-29 1925-1929