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Scientific American, Vol. 44, No. 1 (1881) (1881)
leaf 1
1, produces very distinct sounds, of whose produces them from intermittent puffs of air. A beam of them an intermittent light. With the photophone as with existence and dependence for their production on the light the telephone, there are instruments of different de- light from the sun or from a… … made hitherto with articu- [Continued on page 4.] late speech the instruments © 1881 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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