. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 710. WELL-BORING TOOLS. d, broad edge reamer ; e, composite flaring reamer ;/, shoulder reamer ; g, double-cutting cross reamer ;h, spring circular blade reamer, allfor truing and enlarging td 711. WELL-BORING , the drill stem or sinker bar ;j, drill ja
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 710. WELL-BORING TOOLS. d, broad edge reamer ; e, composite flaring reamer ;/, shoulder reamer ; g, double-cutting cross reamer ;h, spring circular blade reamer, allfor truing and enlarging td 711. WELL-BORING , the drill stem or sinker bar ;j, drill jars to give a hammer action to the drill;k, short sinker bar above the jars;/, temper screw to adjust the length of rope for properly operating the jars and drill;m, clevis or walking-beam strap. 712. WELL-BORING TOOLS. Sand auger. Thebottom is a spiral bit for catching the sand by turn-ing the auger. A door on one side for discharging thesand. MINING DEVICES AND APPLIANCES. 275 713. WELL-BORING TOOLS. Portable power rig and drill beam. A frame tower isU also used above the drill hole for asheave over whichthe drill rope ispassed and to awinch driven by theengine. 714. PROSPECTINGDIAMOND DRILL. A hollow drill bar, /, slides inthe revolving hollow shaft,g, driven by the bevel gear,d, from a motor. Wateris forced through the drillrod by a pump. The drillis tipped with a steel ringstudded with black dia-monds, so that the drillmakes an annular cut byw^hich cores may betaken out for examina-tion. The tailings of thedrill
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
