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Scientific American, Vol. 43, No. 6 (1880) (1880)

leaf 3

An illustration from Scientific American, Vol. 43, No. 6 (1880), 1880, leaf 3
es, it was found that the death rate The method of using this instrument is obvious. The This device is applicable to either the electric, or the in London had rather increased than diminished, having string, or acoustic telephone, and transmits the vibrations penetrating point is forced through… … classes. Villermé calculated that the probable life of the BROCK’S CAN OPENER, nerves, aud enabling persons having defective ears to hear. infant of a weaver at Mulhouse. was as low as 1 year and 6 This device was lately patented by Mr. H. G. Fiske, of months, while that of the baby of the…

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