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Scientific American, Vol. 94, No. 3 (1906) (1906)

leaf 11

An illustration from Scientific American, Vol. 94, No. 3 (1906), 1906, leaf 11
randa, etc. Furthermore, if the conversation is valuable in all public places, such as schools, halls, of- If for any cause nose breathing is too difficult, the fices, and the like, and also in private residences. A plate may be reversed, thereby admitting air, but an nections, as it be- patent on… … journaled on plates, which are hinged to the main

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