Benjamin Count of Rumford's Essays Political, Economical and Philosophical Volume 2

Benjamin Count of Rumford's Essays Political, Economical and Philosophical Volume 2

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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. 1798 edition. Excerpt: ...water was pouring into the jar, its surface was covered with a circular piece of strong writing paper, which was afterwards removed as gently as poffible by means means of a string which was fastened to one side of it; and to prevent the glass jar from being cracked by the sudden application of the boiling-hot water, l began by pouring a small quantity of cold water into the jar, -just enough to fill up the interstices between the ice and the glass, and to cover the ice to the height of about., '7 of an inch z and in pouring the hot water into the jar, out of a large tea-kettle in which it had been boiled, I took care to direct the stream against the mid dle of the circular piece of paper which covered the ice. The jar with the ice and the hot water in it being placed on a tablenear a window, I drew away as gently as poslible the paper which covered the surface of the ice, and prepared myself to observe at my ease the result of this most interesting Experiment. A very few moments were sufficient to show me that my expectation with regard to it would not be disappointed. In the former Experiment a similar cake of ice had been entirely melted in less than three minutes; but in this, after more than twice that time had elapsed, the ice did not show any apparent signs of even beginning to melt. Its surface remained smooth and shining, and the water immediately in contact with it appeared to be perfectly at rest, though the internal motions of the hot water above it, which was giving off its heat to the fides of the jar and to the air, were very rapid, as I could distinctly perceive by means of some earthy particles or or other impurities which this water happened-to i contain. = examined the ice with a very good lens, but it was a long more

Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • United States
  • English
  • black & white illustrations
  • 1236775961
  • 9781236775962