Current Opinion, Volumen74Frank Crane, Edward Jewitt Wheeler Current Literature Publishing Company, 1923 |
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Página 91
... light . It has long been known that green vegeta- tion could take some advantage of elec- tric light ; in the aquarium at Berlin seaweeds and a few minute animals have thriven in tanks deprived of day- light . But this is the first ...
... light . It has long been known that green vegeta- tion could take some advantage of elec- tric light ; in the aquarium at Berlin seaweeds and a few minute animals have thriven in tanks deprived of day- light . But this is the first ...
Página 477
... light . That is , its resistance will change in a degree depending upon the amount of light reflected on it . At first or in the dark , the resistance of the selenium is very high , and it gradually decreases to a small fraction of this ...
... light . That is , its resistance will change in a degree depending upon the amount of light reflected on it . At first or in the dark , the resistance of the selenium is very high , and it gradually decreases to a small fraction of this ...
Página 603
... light from the plate , but when a light portion of the photograph is being received the mirror vibrates and lets through sufficient light to re- 603 produce the tone of the original photo- graph . Any spark or arc radio telegraph ...
... light from the plate , but when a light portion of the photograph is being received the mirror vibrates and lets through sufficient light to re- 603 produce the tone of the original photo- graph . Any spark or arc radio telegraph ...
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