Identifier: supplementtospon02spon (find matches)
Title: Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval
Year: 1879 (1870s)
Authors: Spon, Edward Byrne, Oliver Spon, Ernest Spon, Francis N
Subjects: Engineering
Publisher: London, New York, E. & F.N. Spon
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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al face. The feed is self-acting, but the rate requires to be made variable, and this couldeasily be done by altering the arm G, which is worked by the eccentric E; the hauling barrel H shouldalso be worked by a friction clutch, so as to allow it to slip when the cutters come across anythingunusually hard, or from any other cause become jammed. The endless-chain form of cutter, adoptedin this machine, is advantageous in working over an uneven floor; but the method of attaching thecutter to the chain, by means of bolts, is cumbrous and capable of much improvement, while theform adopted for the cutting teeth would not appear to be the best that could be devised for cutting,not scraping, the coal. This machine must be started from a loose end, and cannot be enteredanywhere, as the Winstardey cutter can. Gillott and Copleys coal cutter, Figs. 865 to 867. The machinery is mounted on a strongcarriage, made sufficiently low to admit of the cutters getting well down to the bottom of the face.
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A is the horizontal cutting wheel, carrying in sockets a number of cutters a. The wheel revolvesround the stationary centre B, fitted to the under side of the covering plate C, which is bolted tothe under side of the fence bracket D, the bracket D is bolted to the bed plate E of the engine,the whole being mounted on travelling wheels F. The cutter wheel A has internal cog teeth, asat b, Fig. 865. In these a spur pinion G gears, the pinion is fixed on the lower end of the spindle H, 392 COAL MINING. working in a long bearing I cast in the fence bracket. On the npper end of H there is a bevelwlieel K, into which geais a coiresponding wheel L on the driving shaft M. The shaft M worksin bearings in N, and has keyed upon it the spur wheel O, deiiving motion from the pinion P onthe crank shaft Q of the engine. The crank shaft is driven by the two oscillating cylinders R,worked either by steam or compressed au*. The action of this machine is as follows;—On startingthe engine a slow but pow

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