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Specific heat measurements have been made on niobium (from 1471 to 22600K), molybdenum (from 1288 to 2015K), tantalum (from 1256 to 23000K), and tungsten (from 1267 to 24100K). The experiments were based on a theory first proposed by Corbino in 1911. It is demonstrated that methods based on this theory account for heat losses from the specimen under test to better than 0'5% even at 2400oK. The theory requires a knowledge of the temperature oscillations in thin a.c. heated filaments and this amplitude is here obtained from photoelectric measurements.

The Specific Heat of Metals Between 1200°K and 2400°K