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Scientific American, Vol. 29, No. 3 (1873) (1873)

leaf 9

An illustration from Scientific American, Vol. 29, No. 3 (1873), 1873, leaf 9
and alleys, and whose voca- linger in a room where the sun is off. People think the ef- Two metallic strips conduct the positive and the negative tions deprive them of its health-giving and beneficial influ- fect is upon thespirits only. This is by no means the case. current respectively to d andc.… … thal motion of any ampli- healthful siimulant, both to the nervous and physical tude required. Fig. 2 also observed among those who are compelled to work in badly systems. The evil effects of keeping such invalids in obscu- shows a vertical section. The central piece is alens which re- constructed…

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