Excerpt from Relative Spectral Transmission of the Atmosphere
The subject ‘oi the transmission of light through the atmosphere has always received considerable attention in astrophysics. Its great importance there lies in connection with the determination of the rate of reception of energy by the earth from the sun.
The subject has, however, an intimate relationship to aerial photography, and, furthermore, has great importance in connec tion with the use of light projectors (i) for automobile and loco motive headlamps; (2) for signaling and as beacons; and (3) for searching on land, on water, and in the air. Little attention seems to have been given to the latter aspects up to recent years.
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