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Show A Difcourfe of Forelt-Trees. Chap.XXX, is fawn, then one or two men with a Lever , muft turn a RoBer, to which there is annext a ftrong Cord, which will draw back the Piece, andlift up the Counter-poife; and fo the piece puta little to- wards one fide, dire&t the Saws againft another. The fecond Figure for Boring , confifts of an Ax-tree , to which is faftned a Wheel offix and thirty Teeth, or more, as the velocity ofthe Water-motionrequires 5 for ifit be ow , more Teeth are requifite; There muft alfo be a Pixion of fix, turn’d by the faid indented Wheel : Then to the Ax-tree of the Pinionis to be fixt a lon Auger, asin letter A, which muft paffe through the ole B, to be opened and clos'd as occafion requires, fomewhat like a Turners Lathe : The Tree or piece of Timber to be Bored, is to be plac’d on the Frame C D,fo as the Frame mayeafily flide by the help ofcertain {mall Wheels, which are in the bollow of it,and turn upon {trong Pins, fo asthe Work-~an may fhove forwards, or draw the Tree back, after“tis faftned to the Frame 3 that fothe Auger turning,the end of the Tree maybe applied toit; {till remembring to draw it back at every progreffe of three or four ézches which the Auger makes for the clenfing it from the Chips , leaft the Auger break; Continue this worktill the Tree, or piece of Timber be bored as far as you think convenient, and when you defire to inlarge the hole, change your Auger Bits asthe Figure reprefents them. mh |