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He bolometer It is an instrument used to collect and measure the radiation emitted by an object at all wavelengths.

In practice, the radiation to be measured is dropped into a "detector" causing a temperature rise that causes the electrical resistance of a circuit to vary, which, in turn, is connected to a reading instrument.

With such an apparatus it is possible to determine the so-called bolometric magnitude of a star, that is: its luminosity not only in visible light, but throughout all the radiations, visible or not, emitted by it.

It is used to study the amounts of energy radiated by a celestial source. The inventor of this instrument was the American astronomer Samuel P. Langley in 1878, with whom he studied the infrared radiation of the Sun.

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