The Family Tutor

The Family Tutor

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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. Excerpt: ...large towns, is pure, with the exception of a small portion of the atmospheric gases. Water formed from fallen snow newly collected in the open country, is still purer. The purity of water may be tested by its action on an alcoholic solution of soap. Such a solution mixes perfectly with pure water, and forms a clear liquid; but the slightest impurity produces a milky turbidity. Water which will not dissolve si freely is said to be hard. Peroxide of Hydrogen.--Water is the only substance formed by the direct combination of oxygen and hydrogen; but, by a peculiar process, which will be explained hereafter, these elements may be made to unite in the proportion of 16 parts of oxygen to one of hydrogen. The compound, called peroxide of hydrogen, or oxygenated water, is a transparent and colourless liquid, which resembles water in appearance, has a sharp pungent taste, blisters the skin, and bleaches vegetable colours. It is very easily decomposed, the least elevation of temperature, or even agitation, causing it to give off half its oxygen, and pass to the state of ordinary water. line OA. Let this circular arc be moved into the position aOb; then, since the angles in the same segment of a circle are equal to one another (Euclid, B. iii. Prop. 21), therefore the straight line 40 makes the same angle with the fixed straight line Oa that BO does; consequently the points O, B, and 6, must lie in one straight line. Remark. As the angle in a semicircle is a right angle, it is plain that if the arc in question be semicircular, the lines described by its extremities will be at right angles to one another: and it is im the other, and has one of its extremities hinged at the middle point C thereof, the other being capable of turning in the same plane about a fixed...show more

Product details

  • Paperback | 258 pages
  • 189 x 246 x 14mm | 467g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236891686
  • 9781236891686