Template:Are You Sure/April 7: Difference between revisions
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• ... that physicist '''[[Ernst Ruhmer (nonfiction)|Ernst Ruhmer]]''' (April 15, 1878—April 8, 1913) investigated practical applications of the light-sensitivity properties of selenium, which he employed in developing wireless telephony using line-of-sight optical transmission, sound-on-film audio recording, and television transmission over wires? | • ... that physicist '''[[Ernst Ruhmer (nonfiction)|Ernst Ruhmer]]''' (April 15, 1878—April 8, 1913) investigated practical applications making use of the light-sensitivity properties of selenium, which he employed in developing wireless telephony using line-of-sight optical transmission, sound-on-film audio recording, and television transmission over wires? | ||
Revision as of 04:07, 7 April 2020
• ... that physicist Ernst Ruhmer (April 15, 1878—April 8, 1913) investigated practical applications making use of the light-sensitivity properties of selenium, which he employed in developing wireless telephony using line-of-sight optical transmission, sound-on-film audio recording, and television transmission over wires?