Popular Science News Volume 5-7

Popular Science News Volume 5-7

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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. 1871 edition. Excerpt: ...The startling and paradoxical feat of freezing water in a red-hot vessel depends upon the property of liquids to remain below their boiling point while in the spheroidal state. A small quantity of liquid sulphnrous acid is put into a red-hot platinum cup or crucible. It assumes the spheroidal state, and its temperature remains at about 12 F. or twenty degrees below the freezing point of water. If a little water is now added to it, the water instantly freezes, and the bit of ice may be thrown out of the red-hot vessel. This is bnt one of several ways in which the experiment may be performed. The experiment of dipping the hand into melted lead is explained upon the same principle. The hand is instantly covered with a layer of spheroidal liquid, from its own moisture, and this prevents its coming in contact with the molten metal. The hand is exposed to radiant heat alone, which is mainly expended in forming the vapor that envelops it. The only danger is in not having the metal hot enough. Its temperature ought to be considerably above its melting point. If the hand is not naturally moist, it is well to wipe it with a damp cloth before immersing it in the metal. The experiment, if properly conducted, is a perfectly safe one, but few persons have the nerve requisite for trying it. It is hardly necessary to explain how boiler explosions may be caused by the sudden change of water from the spheroidal state to that of violent ebullition. If the water is too low in the boiler, so that portions of the surface become red-hot, and water is then admitted, it may as 99.97 _ _ ___i--7 _ _ _4_ sumo the spheroidal condition, and as the overheated metal cools down, its almost instantaneous conversion into steam may subject the boiler to a strain greater...show more

Product details

  • Paperback | 728 pages
  • 189 x 246 x 37mm | 1,279g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236786297
  • 9781236786296