Descriptive List of Elementary Physical Experiments; Intended for Use in Preparing Students for Harvard College ...

Descriptive List of Elementary Physical Experiments; Intended for Use in Preparing Students for Harvard College ...

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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: ... A test-tube having a small tube leading out at the side. Two pieces of glass tubing, each about 15 cm. long and in other dimensions nearly like the side branch of the testtube. A piece of rubber tubing about 15 cm. long of a size to fit closely over the glass tubing. A solid rubber stopper to fit the test-tube. A tumbler or beaker-glass nearly full of cold water. Some means of heating water at the bottom of the testtube (a Bunsen burner or a small kerosene lamp). A small plate of glass (a bit of window-pane a few ems. square). Half fill the test-tube with water. Holding the glass plate just above the top of the test-tube, heat the water somewhat, though not to boiling. Notice and record any change in the appearance of the glass plate. Now fill the test-tube nearly to the side tube with cold water. Close the top tightly with a cork-stopper, pierced however by one of the glass tubes, the end of which should reach 3 or 4 cm. beneath the surface of the water. Fit one end of the rubber tube over the side branch of the test-tube and fit the other end to the remaining glass tube. Let the other end of this glass tube, which should be kept nearly vertical, dip 1 or 2 cm. beneath the cold water in the vessel provided. Hold the test-tube by means of a. thick band of paper near the top and gradually heat the water, applying the heat at the bottom of the tube. Raise the water thus to vigorous boiling, noting carefully, from the start, and recording the appearance and behavior of the bubbles in both the test-tube and the larger vessel alongside, trying to distinguish between bubbles of air and bubbles of vapor. Cease heating the water, and note what happens as it begins to cool. Remove the cork-stopper from the test-tube and close the side passage more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236866320
  • 9781236866325