Compressed air . s develop- thcm. Both electric and pneumatic motorsare of such recent development that manypractices that ought to be obsolete stillprevail, especially in railway shops, wherecompetition does not exert the samestimulus as in commercial shops. The shops of the immediate past hada main shaft driven by a Corliss shaft drove all the machine was either a mechanical or a handcrane—or none at all—over the erectingor assembling floor. Present practicedrives generators direct by high-speed automatic engines ; takes the current tolarge 20 or 30-horse-power motors
Compressed air . s develop- thcm. Both electric and pneumatic motorsare of such recent development that manypractices that ought to be obsolete stillprevail, especially in railway shops, wherecompetition does not exert the samestimulus as in commercial shops. The shops of the immediate past hada main shaft driven by a Corliss shaft drove all the machine was either a mechanical or a handcrane—or none at all—over the erectingor assembling floor. Present practicedrives generators direct by high-speed automatic engines ; takes the current tolarge 20 or 30-horse-power motors (rele-gated to the rafters in the shops), each COMPRESSED AIR. 3997 driving a group of machines, throughmain and countershafts, some heavy ma-chines having individual motor-drive; andalso installs an air compressor, reservoirand piping, with motors and hammers foruse on the floor and outside. While it is probable that individual andgroup drive will be retained much as atpresent, the impending advance in shop. IXTERXAI. MECHANISM OF AIR HOIST, SHOW-ING THE SMALL PNEUMATIC ENGINESDRIVING THE WORM OF THE WORMGEAR. betterment with increase of capacity, in-dicates that many heavy operations willbe done by portable tools (whether lightelectric or air, or the heavier electric-driven machines carried on trucks ortransferred by crane) avoiding the effort of moving the mountain to is this phase of the question that in-terests us, for it means a transformationnot only of work done by hand to workdone by po%yer. but also transplanting ofwork done in the machine shop to workdone on the floor, and the savings andeconomies to be effected will be greater than those obtained throughindividual or group electric machine-drives—greater even than those obtainedby high-speed steels. For example: Ifit takes 14 hours to set up a job and 6 todo it. of which during less than 3 a high-speed tool is actually cutting, a saving of10 or 12 hours might be realized by mov-ing
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
