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Scientific American, Vol. 83, No. 25 (1900) (1900)

leaf 3

An illustration from Scientific American, Vol. 83, No. 25 (1900), 1900, leaf 3 — ames, advantage was taken of the oppor- tunity of sinking two temporary shafts from a timber A new telephone transmitter and receiver has been The teeth of each ratchet-wheel are adapted to be en- staging in the river, since by this means it-has been devised by Mr. Andrew Plecher, of Stanford… … —__>+0+2—__ individual turns nearly touch one an- POWER SCRAPERS ON THE ST. LAWRENCE POWER other. One end of the coil is con- COMPANY’S CANAL. north and south, and to convey the ballast excavated nected with one diaphragm, D, and the other end to the top of the shaft and to discharge it direct into…

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