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Orig. bildtext... FATHOMETER AND ITS FATHER. Washington, D.C. Dr. Herbert G. Dorsey, of the Coast and Geodetic Survey, with the instrument which he invented for taking radio soundings of ocean depths. The device sends out a continiuous signal which is returned from the bottom of the sea as an echo and picked up by a sensitive radio receiver which amplifies it and indicates on a dial the exact depth. 8-22-28 Anm. Mätinstrument Ekoljud persons: HERBERT DORSEY sites: USA;WASHINGTON D C.

Orig. bildtext... FATHOMETER AND ITS FATHER. Washington, D.C. Dr. Herbert G. Dorsey, of the Coast and Geodetic Survey, with the instrument which he invented for taking radio soundings of ocean depths. The device sends out a continiuous signal which is returned from the bottom of the sea as an echo and picked up by a sensitive radio receiver which amplifies it and indicates on a dial the exact depth. 8-22-28 Anm. Mätinstrument Ekoljud persons: HERBERT DORSEY sites: USA;WASHINGTON D C.
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Orig. bildtext... FATHOMETER AND ITS FATHER. Washington, D.C. Dr. Herbert G. Dorsey, of the Coast and Geodetic Survey, with the instrument which he invented for taking radio soundings of ocean depths. The device sends out a continiuous signal which is returned from the bottom of the sea as an echo and picked up by a sensitive radio receiver which amplifies it and indicates on a dial the exact depth. 8-22-28 Anm. Mätinstrument Ekoljud persons: HERBERT DORSEY sites: USA;WASHINGTON D C
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Taille de l'image:
3016 x 3823 px | 33.0 MB
Taille d'impression:
25.5 x 32.4 cm | 10.1 x 12.7 in (300 dpi)