Platinum rhodium thermocouple with one fireclay sheath, by Cambridge Instrument Company Limited, London, England, 1925-29. Platinum Rhodium Thermocouple, 1925-29 1925-1929
Glass tube of rhodium - tin alloy prepared by the discoverer Dr. William Hyde Wollaston about 1825 Specimen of Rhodium Alloy in roughly triangular pieces 1822-1825