. Cassier's magazine . 134 CASSIERS MAGAZINE. ELECTRIC CHANNELERS IN OPERATION AT THE TATE QUARRY springs, also between the lower leverand the frame, and the motion of themachine along the track is secured byconnecting the crankshaft of the en-gine with the trucks through a sys-tem of gears. With this type of thechanneller there is a constant relationbetween the speed of the machineand the strokes of the drill. Whenelectricity is used in place of steampower a connection is made betweenthe electric motor and the shaft bymeans of bevel gears. At the Vermont quarries much ofthe marble is fashione
. Cassier's magazine . 134 CASSIERS MAGAZINE. ELECTRIC CHANNELERS IN OPERATION AT THE TATE QUARRY springs, also between the lower leverand the frame, and the motion of themachine along the track is secured byconnecting the crankshaft of the en-gine with the trucks through a sys-tem of gears. With this type of thechanneller there is a constant relationbetween the speed of the machineand the strokes of the drill. Whenelectricity is used in place of steampower a connection is made betweenthe electric motor and the shaft bymeans of bevel gears. At the Vermont quarries much ofthe marble is fashioned into tomb-stones, statuary, and other forms inthe mills, which have been erected insome instances immediately over thebeds. For cutting the slabs into suit-able sizes sand-saws are used almostentirely. The saws are made ofsoft iron, but without teeth, sandbeing substituted for the latter. Theiron blades move back and forth,forcing the particles of sand againstthe material and thus cutting it. The sand is supplied to the marble in astream o
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