. American engineer and railroad journal . pth. The capstan wheels in front of thebed are for closing the chuck jaws. Thehandles hanging down in front of the headsand chucks are ratchet levers for movingthem along the bed. The machine is pro-vided with three feeds, and is driven by General Electric 220-volt motor mounted on a bracketbolted to the machine, as shown. The rawhide pinion on themotor shaft meshes with the large spur gear on the machine, including the motor, occupies a floor space of 4by 18 ft., and weighs about 10,000 lbs. It is made by The NazelEngineering & Ma
. American engineer and railroad journal . pth. The capstan wheels in front of thebed are for closing the chuck jaws. Thehandles hanging down in front of the headsand chucks are ratchet levers for movingthem along the bed. The machine is pro-vided with three feeds, and is driven by General Electric 220-volt motor mounted on a bracketbolted to the machine, as shown. The rawhide pinion on themotor shaft meshes with the large spur gear on the machine, including the motor, occupies a floor space of 4by 18 ft., and weighs about 10,000 lbs. It is made by The NazelEngineering & Machine Works, Philadelphia. The portable milling machine, illustrated herewith, is de-signed for work up to S ft. in length. As it is motor-driven,it may be taken to the work, and thus can easily do workwhich could not be handled by other classes of tools. Thecarriage has a travel of 8 ft. with automatic feed; the crossslide has a movement of 12 ins.; the vertical spindle has ataper hole to receive taper shank mills, and has a movement. BOOKS. UNDERWOOD PORTABLE MILLING MACHINE. of 10 ins.; the cross slide has a hand feed. The bed is mount-ed on a sub-base, and may be accurately adjusted by set screwsand taper space pieces, which securely hold the two beds to-gether. The sub-base is fitted with long slots and projectionsfor attaching it to the work by clamps or bolts. This ma-chine has been developed at the works of the Underwood Com-pany, of Philadelphia, and has been added to the line of toolswhich they manufacture. Valve Gears for Steam Engines. By Cecil H. Peabody. Secondedition. Thoroughly revised. 142 pages. 33 folding by John Wiley & Sons, New York, 190(1. Price,$ This is a revised edition of the former book by the same author,and is stnted to be intended to give engineering students instruc-tion in the theory and practice of designing valve gears for steamengines. The authors aim has been to give the learner a firmgrasp of the principles of valve ge
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
