"Becquerel was the first, I believe, to use this property. But the
machine which you see here was one recently invented for
registering the temperature of sea water so as to detect the
approach of an iceberg. I saw no reason why it should not be used
to measure heat as well as cold.
"You see, down there I placed the couples of the thermopile
beneath the electric furnace on the table. Here I have the
mechanism, operated by the feeble current from the thermopile,
opening and closing switches, and actuating bells and lights.
Then, too, I have the recording instrument. The thing is
fundamentally very simple and is based on well-known phenomena. It
is not uncertain and can be tested at any time, just as I did
then, when I showed a slight fall in temperature. Of course it is
not the slight changes I am after, not the gradual but the sudden
changes in temperature."
"I see," said Carton. "If there is a drop, the current goes one
way and we see the red light; a rise and it goes the other, and we
see a green light.
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