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![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. [...]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MzcvMDEvMDEvcGhvdG9lbGVjdHJpYy1yYXktdG8tZGV0ZXJtaW5lLWZseWluZy1jZWlsaW5nLXdhc2hpbmd0b24tZGMtanVuZS0xNS10by1wZXJtaXQtNjQwLmpwZw%3D%3D/40/49/webp "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. [...]")
Emelie von Walterstorff i textila studiesamlingen på Nordiska museet. Hon arbetade på Nordiska museet mellan 1903 och 1933 som textilexpert och konstnär. Bland annat avbildade hon museiföremål i akvarell på katalogkort.
Summary
Emelie von Walterstorff i textila studiesamlingen på Nordiska museet. Hon arbetade på Nordiska museet mellan 1903 och 1933 som textilexpert och konstnär. Bland annat avbildade hon museiföremål i akvarell på katalogkort.
Tags
Date
01/01/1903 - 01/01/1933
Source
Digital museum
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