Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 28
nsmust be devised of making the indications of heat and coldvisible to you, and for this purpose an ordinary thermometerwould be useless. You could not observe its action; and asit is my desire that we should be copartners in these labours,I am anxious that you should see with your own eyes… … This instrument, A B (fig. 1), is called a thermo-electricpile, or more briefly a thermo-pile. It acts thus:—Whenheat is communicated to the face a of the pile it generatesan electric current; and an electric currenthas the power ofdeflecting a freely suspended magnetic needle, to which itflows…
Heat
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