Historic Framed Print, Photoelectric ray to determine flying ceiling. Washington, D.C., June 15. To permit a ground observer to determine at what height flying is safe during days of fog and heavy overcast, Miss Elizabeth M., 17-7/8" x 21-7/8"

Historic Framed Print, Photoelectric ray to determine flying ceiling. Washington, D.C., June 15. To permit a ground observer to determine at what height flying is safe during days of fog and heavy overcast, Miss Elizabeth M., 17-7/8" x 21-7/8", Image: 16" x 20"

Beautiful historic reproduction print from the Library of Congress collections.

Created 1937 or 1938 Title from unverified caption data received with the Harris & Ewing Collection. Date based on date of negatives in same range. Gift; Harris & Ewing, Inc. 1955. General information about the Harris & Ewing Collection is available at Photoelectric ray to determine flying ceiling. Washington, D.C., June 15. To permit a ground observer to determine at what height flying is safe during days of fog and heavy overcast, Miss Elizabeth M. Zandonini, of the Radio Section staff of the Bureau of Standards, is shown with the balloon transmitting equipment. A photoelectric cell measuring light brightness is used to control the pitch of the radio signal transmitted from the balloon as it ascends. A graphical frequency recorder plots the pitch and hence [...] a measure of the light brightness as a function [...] height. The experiments are carried on for the U.S. [...] Glass negatives.

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