10 quotes
The quantity E is called the emissive power of the body.
On the Relation Between the Emmisive and Absorbtive Power (1882)
All heat rays follow the same laws in their propagation, which are known for light rays.
On the Relation Between the Emmisive and Absorbtive Power (1882)
Under these conditions the following law holds : The ratio between the emissive and the absorptive power is the same for all bodies at the same temperature.
On the Relation Between the Emmisive and Absorbtive Power (1882)
Heat rays have the same nature as light rays... The invisible heat rays are distinguished from light rays only by the period of vibration or the wave length.
On the Relation Between the Emmisive and Absorbtive Power (1882)
[R]adiation in empty space will be investigated..⇒ the [associated] black bodies must have a refracted index which differs infinitely little from 1.
On the Relation Between the Emmisive and Absorbtive Power (1882)
A perfect mirror, like every diathermanous body, can itself send out no rays; for if it did (confined in an enclosure of like temperature) it would warm this enclosure... and cool itself more and more.
On the Relation Between the Emmisive and Absorbtive Power (1882)
This law will be proven, first, for the case where only black bodies are compared with each other, that is, those whose absorptic power = 1; i.e., it will be shown that the radiating power of all black bodies is the same at the same temperature.
On the Relation Between the Emmisive and Absorbtive Power (1882)
A black body... must have the same refractive index as the medium... then there will be no reflection at its surface, and all incident rays... wholly absorbed.
On the Relation Between the Emmisive and Absorbtive Power (1882)
Before a body... imagine two screens, S1 and S2 placed in which are two openings 1 and 2, whose dimensions are infinitely small with respect to their distance apart, and each of which has a center.
On the Relation Between the Emmisive and Absorbtive Power (1882)
The proof of this special law is similar to that of the general law, but simpler; it will therefore facilitate the understanding of the latter. Moreover, conclusions which are drawn from the special law will be used in the proof of the common law.
On the Relation Between the Emmisive and Absorbtive Power (1882)