. American engineer and railroad journal . rthy of note: that is,the ability to reach and control the speeds di- jrectly from one point without having to operatea number of levers at dififerent parts of the ma-chine in connection with an index plate. Theloss of time incident to an arrangement wherethe operator is required to read a set of direc-tions and then manipulate a number of leversand gears on different parts of the machine inaccordance with those directions is liable to beconsiderable. The variable-speed mechanism is illustratedin the engravings. Figs. 39 to 42, and in sectionin Fig. 4
. American engineer and railroad journal . rthy of note: that is,the ability to reach and control the speeds di- jrectly from one point without having to operatea number of levers at dififerent parts of the ma-chine in connection with an index plate. Theloss of time incident to an arrangement wherethe operator is required to read a set of direc-tions and then manipulate a number of leversand gears on different parts of the machine inaccordance with those directions is liable to beconsiderable. The variable-speed mechanism is illustratedin the engravings. Figs. 39 to 42, and in sectionin Fig. 43. The general principle mechanicallyof the device is that of making use of severaltrains of gears which are capable of several dif-ferent gear combinations, but the system ofclutching and operating levers is decidedlynovel. As will be noticed in the engravings,there are three sets of gears of three gearseach, a total of nine gears, giving nine speeds,and this number is doubled by the back gearson the spindle 6f the drill. The gears, ABC,. F70 39.—XEW R.\I)IAL DRILL WITH \ ARL\BLE SIEED DRIVE.—WM. E. GANG COMPANY.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
