THOMSON, WILLIAM (BARON KELVIN OF LARGS). - A NEW THERMO-ELECTRIC EFFECT.

The Bakerian Lecture. - On the Electro-dynamic Qualities of Metals. Received February 28, - Read February 28, 1856.

(London, Richard Taylor and William Francis, 1856). 4to. No wrappers as extracted from "Philosophical Transactions" Vol. 146 - Part III. Pp. 649-751 a. 58 textillustr. of experimental apparatus. Clean and fine.

First appearance of Lord kelvin's large account of his thermo-electric researches in which he found, that the Peltier-effect must be directly proportional to the absolute temperature in a circuit formed of two metals. "This result, however, as Thomson well knew, was contradicted by the observations of Cumming, who had shown that when the temperature of the hot junction is gradually increased, the electromotive force rises to a maximum value and then decreases. The contradiction led Thomson to PREDICT THE EXISTANCE OF A HITHERTO UNRECOGNIZED THERMO-ELECTRIC PHENOMENON - namely, a reversible absorption of heat at places in the circuit other than the junctions.(Whittaker "A History of the Theories of Aether & Electricity", pp. 237-38).

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