Helmholtz takes the case of a circuit of resistance R in which acts an electromotive force due to a battery or thermopile.
The principle of the thermopile we need not describe in detail.
Indeed, the thermopile in the hands of Lockyer has already made palpable the heat of the fixed stars.
So far as I know, this is the first application of the thermopile to variables.
The heat of a match, or the cold of a piece of ice, will produce a current, even if held at some distance from the thermopile.
For years the efforts of inventors have been directed towards obtaining electrical energy from heat by means of the thermopile.
This may be proved experimentally with proper apparatus, as for example with an instrument known as the thermopile.
Change or apparent change in intensity; observed by energy received by thermopile.
It might seem invidious to remark that but few know what is the real trouble with the thermopile.
The main use of the thermopile has been in scientific investigations, especially in the science of heat.