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Scientific American, Vol. 37, No. 24 (1877) (1877)

leaf 7

An illustration from Scientific American, Vol. 37, No. 24 (1877), 1877, leaf 7
nds for reaching any distance on the work and phone placed in the colliery offices, and then taken. down The machine illustrated herewith is a. combined foot pow- the shaft and fixed in the main intake—an ordinary coated the vibrating lever are the same as here shown. er drill and turning lathe,… … touched it. The removal of the grass was followed by aces- fuel, reducing the time and expense usually required for the sation of sound from the telephone, but the sound became yenewal and repair of bridge walls and preventing smoke by and anvil, in the construction of which many novel features…

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