Thomas Jefferson Papers

Academy of Natural Sciences of Philadelphia: Extracts from Minutes, 2 Feb. 1819, 2 February 1819

Extract from the Minutes of the Academy of Natural Sciences of Philadelphia; Feby 2, 1819.

‘Dr Hare read a paper on a new instrument by which he considers that it is shewn, that the heat produced by the Salvanie apparatus, is not the effect of electricity; but a collateral result of the laws which produce the motion of this fluid.

‘Twenty copper & twenty zinc plates were supported vertically in a frame of copper & zinc, alternating at half an inch distance from each other; & the plates of the same kind of metal are soldered to strips meeting together; so that one set of plates forms a continuous metallic superficies.

‘When the copper & zinc surfaces thus formed, are united by an intervening wire; & the whole immersed in an acid or aceto-saline solution, in a vessel devoid of partitions; the connecting wire becomes intensely ignited: and when the hydrogen is liberated, it is very often inflamed.

‘The instrument is termed Calorimotor, & & the process calorimotion; in contradistinction to Electromotor & Electromotion!

NB. This minute was substituted for one registered at a former meeting.

DLC: Papers of Thomas Jefferson.

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