/3 = 1,680,000 deg., an intensity
exactly "2,000 times greater than that of red-hot iron" at a temperature
of 840 deg.. The distance of the comet from the solar surface being equal to
one-third of the sun's radius, it will be seen that, in accordance with
the Newtonian doctrine, the temperature to which it was subjected
indicated a solar intensity of
4 squared x 1,680,000
-------------- = 2,986,000 deg. F.
3
The writer has established the correctness of the assumption that "the
temperature is as the density of the rays," by showing practically that
the _diminution_ of solar temperature (for corresponding zenith distances)
when the earth is in aphelion corresponds with the increased diffusion of
the rays consequent on increased distance from the sun. This practical
demonstration, however, has been questioned on the insufficient ground
that "the eccentricity of the earth's orbit is too small and the
temperature produced by solar radiation too low" to furnish a safe basis
for computations of solar temperature.
In order to meet the objection that the diffusion of the rays in aphelion
do not differ sufficiently, the solar pyrometer has been so arranged that
the density, _i.
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