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Resistivity of Mercury at the lemperature of Liquid Air.
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9314 C.G.S. units per degree rise of temperature on the platinum scale; between —108-4° and — 57‘6° the mean increase in resistivity in C.G.S. units per degree is 109’6 ; in the liquid condition between the temperature —35‘2° and 0° the mean increase in resistivity in C.G.S. units per degree is 83"2; temperature measurement being on the platinum scale as above defined. It may be stated here that temperatures defined by this platinum scale do not differ by more than about 0‘5° from the Centigrade scale down to temperatures of —100°, but that the temperature of boiling liquid oxygen which, on the Centigrade scale is denoted by —182°, is, on the platinum scale
