Object Lessons and How to Give Them

Object Lessons and How to Give Them

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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. 1883 edition. Excerpt: ...more prominent qualities of cork. It is light, soft, elastic, compressible, and impervious to water. Secondly, a piece of uncut cork should be compnred with the bark of an ordinary tree and the similarity pointed out, and the children may then be told that cork is the outer covering or bark of u tree; but that the cork-tree does not grow in this country. Thirdly, the teacher will show how its special properties adapt it for certain uses. a. As stoppers for bottles. It is compressible, and can thus, when properly cut, be pressed or forced in. Show this by experiment. Let the children notice that the cork is larger than the opening of the bottle, and then press it in. It is elastic. Show that the neck of the bottle increases in size from the mouth downwards, and how the cork presses out and fills the neck. This fixes the cork in tightly and prevents the liquid inside from getting out. An old champagne cork will show this admirably. It is impervious to water and other liquids, hence these cannot escape from the bottle. b. Its lightness makes it valuable for the construction of life belts and jackets to keep people from sinking in the water and being drowned. Also for making lifeboats and floats for fishing-nets. This property and use may be prettily illustrated by taking a wooden doll and weighting it a little in the feet just sufficient to make it sink, and then supporting it by a ring of cork used as a life-belt, or strips of cork tied round the body illustrating a cork jacket. c. Its lightness and warmth make it suitable for inner soles of boots. The children will readily appreciate light boots and warm feet. Advantage may be taken here to inculcate carefulness in keeping the feet warm and dry to prevent illness. LESSON XVII. LEATHER....show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236908414
  • 9781236908414