Educational Pamphlets

Educational Pamphlets

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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. 1917 edition. Excerpt: ...as primary air, the combustion, of course, would, in a given chamber, be instantaneous and would constitute what we call an explosion. It is this principle which i.s used in a gas engine or in all so--called internal combustion engines in which the proper mixture of gas and air is admitted to the cylinder, the port of admission closed, and ignited with an electric spark. Gas engines are used in large quantities, particularly where small units for power are required. They can, with safety, be set in almost any place and have the great ad-vantage over a steam engine and boiler in the small amount of space required, small weight of apparatus, no dust or ashes and freedom from danger of fire. In Philadelphia such gas engines are used to operate the large pumps to force water at increased pressure through the high-pressure water mains for extinguishing fires. Fourth: Another method of burning gas consists of supplying pure oxygen to the flame instead of obtaining oxygen from the air. This gives a short flame of very high temperature and is used for a number of purposes, such as cutting through steel plate, brazing, welding, etc. In the first three methods described atmospheric air was used for supporting combustion, and with each volume of oxygen in the air thus used there were supplied also four volumes of nitrogen, an inert gas which had to be raised to the same temperature as the other products of combustion, and passed off with them, removing a large quantity of heat by the process known as convection. Not only this, but it enlarged the flame volume and, therefore, defeated the localizing of combustion by which high temperature is achieved. In the use of this method the gas and oxygen are supplied by two separate tubes, the mixing not...show more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236922867
  • 9781236922861