Biology Pamphlets Volume 281

Biology Pamphlets Volume 281

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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. 1889 edition. Excerpt: ...can by no means be depended upon. After many and vain efforts to obtain efficient power for my laboratory the following plan was hit upon, and has proved wholly satisfactory. The method is very simple. It consists in providing a tank with an inlet valve operated by a float. As the water is withdrawn from the tank the float sinks and opens the valve, and the inflowing stream of water brings the water in the tank back to the full height. As the inlet valve permits a much larger stream of water to pass than the outlet valve does, the tank always stands essentially at the same level. The simplicity of my whole arrangement is one of its particular features. The tank consists of a vinegar barrel. It is set upon a platform in the story above my laboratory, and gives a fall of about fifteen feet. The water supply is taken from the city water that is piped throughout the building. The pipe conducting the water to the laboratory below is a small lead pipe and siphons the water over the top of the barrel. It is almost as easily put in place as rubber tubing, and can readily be changed to reach any part of the laboratory. It is closed at the lower end with a short piece of rubber tubing and a screw pinchcock, with whieh connection can be made with a water motor or other apparatus. The float and valve in the barrel are such as plumbers usually furnish for dwelling houses. With this arrangement a practically uniform head of water is available at all times, and although a fall of more than fifteen feet would be desirable, yet it has proven ample to run a centrifuge, using a Crowell water motor. A larger tank and more extensive plumbing might be used, but the arrangement as I have described it is so easily constructed and inexpensive as to be more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • United States
  • English
  • black & white illustrations
  • 1236988930
  • 9781236988935