The brass coverings defend both bulbs from solar radiation, or any adventitious source of heat.
What relations are there of solar radiation to our atmosphere?
It utilizes, I might add, not only solar radiation but that of the stars as well.
Had no other obstacle existed, this alone would have been sufficient to render the observations on solar radiation impossible.
After all, why should the intensity of the solar radiation upon Venus be regarded as inimical to life?
If we can imagine the earth cut off from the solar radiation, the air would cease to move.
Such a frozen fog is an effective reflector of solar radiation.
On the hill tops the cold of night will be still more intense and so, also, will the solar radiation by day.
In other words, the temperature produced by solar radiation is as the density of the rays.
Such a counteracting force is perhaps found in solar radiation.