Industrial Management; The Engineering Magazine Volume 29

Industrial Management; The Engineering Magazine Volume 29

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...fitted with any special devices. The workman in charge contents himself with turning the flywheel, either by his own effort or with the help of one or more assistants, until a proper explosion is secured, sufficient to turn the shaft at a speed which will overcome the frictional resistances and produce the necessary compression leading to the next explosion. This procedure, while primitive and tiresome. is likely to remain long in use so far as small motors are concerned. Caution should, however, be given. in every case, not under any circumstances to attempt to move the wheel by bearing down with the foot upon its arms. Most of the accidents which have occurred in starting internal-combustion engines have arisen from this faulty and dangerous practise. The wheel should be turned only by pulling by hand upon the rim. Motors in which the compression exceeds 80 to 100 pounds per square inch (6 to 7 kilogrammes per square centimetre) are generally provided with a so-called "relief cam." This operates by opening the escape valve for an instant, just at the period of compression. thus allowing part of the mixture to escape. The pressure is thus kept within limits which can be overcome by the hand turning of the flywheel, and the piston can be forced to the end of its stroke in the cylinder. To avoid the inconvenience of pulling on the flywheel, there have been devised systems of hand cranks operating on the crank shaft, constituting a sort of safety appliance by which is avoided all the danger arising from an unexpected back stroke of the engine. Designers and constructors of internal-combustion engines have given considerable attention to the matter of greater convenience in starting devices, and the results are apparent in more

Product details

  • Paperback | 358 pages
  • 189 x 246 x 19mm | 640g
  • United States
  • English
  • black & white illustrations
  • 123696554X
  • 9781236965547