Samuel Pierpont Langley

“ It is very easy at all times to cut off the sun's direct light by a screen; unless the screen be at an enormous distance from the eye, however, this glare is not diminished by its use. Mr. Huggin's method is founded principally on two considerations.
⁠The first is, that the principal coronal radiation (as found in Egypt by Dr. Schuster in the late eclipse) occupies a narrow part of the spectrum between G and H, while the atmospheric glare consists of light of all refrangibilities. ”