. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . to thehours of the day and night. The in-strument is adapted for a vacuum aswell as for a pressure-gauge, and, ifsufficiently sensitive, it will serve asa barometer, and measure changes ofatmospheric pressure. Another ap-plication of the pressure-tube is inthe recordins: thermometer. The tubemay be filled with a very expansibleliquid, such as alcohol, and in temperature produceexpansion of the incl
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . to thehours of the day and night. The in-strument is adapted for a vacuum aswell as for a pressure-gauge, and, ifsufficiently sensitive, it will serve asa barometer, and measure changes ofatmospheric pressure. Another ap-plication of the pressure-tube is inthe recordins: thermometer. The tubemay be filled with a very expansibleliquid, such as alcohol, and in temperature produceexpansion of the inclosed liquid,which in turn give deflections of thetube to correspond. GEAR CUTTING &• SItnrpes Automatic Gear-Cutter, shown in Fig. 1. is automaticin all its motions, cutting throughfor each tooth, and revolving thewheel until all the teeth are cut. thusenabling the operator to attend to other work. The indexing is done Fig. l.—Gear-cutter, by a worm and worm-wheel moved bv change-gears. The blank being put in place, and the cutter-head adjusted for length ofstroke, the wheel is lowered by a screw having a dial reading to thousandths of an inch, until. 393 GEAR-CUTTING MACHINES. the proper depth of cut is obtained, when the cutter passes through the blank and back by aquick return movement; the wheel is then moved the proper distance for the next tooth, andso on until finished. The cutter-head is adjustable at any angle for cutting bevel-wheels, thedegrees being marked on a graduated arc, no other change being required. There is also pro-vision for moving the cutter out of center eacli way, for cutting ljevt4-\vheels. Rilgmms Bcvd-Gear Cutter is shown in Figs. 2 and 3. The princii)le of the machine isexplained as follows: It is possible to make with any system of interchangeable gears a rack
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
