Hundreds of Things a Boy Can Make a Hobby book for Boys of All Ages
Hundreds of Things a Boy Can Make a Hobby book for Boys of All Ages
Kaiserlich Deutsches Archologisches Institut
The book Hundreds of Things a Boy Can Make a Hobby book for Boys of All Ages was written by author Kaiserlich Deutsches Archologisches Institut Here you can read free online of Hundreds of Things a Boy Can Make a Hobby book for Boys of All Ages book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Hundreds of Things a Boy Can Make a Hobby book for Boys of All Ages a good or bad book?
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If the fitting of the jar, the funnel, or the tubing, has not been done perfectly, run sealing wax round the joins in order to make them air-tight. When all is ready, place your finger over the outside end of the elbow joint of glass, and then fill the funnel with water. Nothing happens. The water stays in the funnel. Now, take your finger away from the glass tube, and immediately the water rushes from the funnel down into the jar. Why ? In the first case, the jar was filled with air and its pr...essure kept the water high up in the funnel, but the moment your finger was taken away, the water pushed the air out of the jar, up through the tube and into the room. This is, of course, a little experi- ment to prove that air exerts a constant pressure. AN ELECTRIC BELL The making of an electric bell from odd pieces of metal, wood and other substances is not an exceedingly difficult matter. Any mechanically minded boy can do it with a little care, if he will study the accompanying diagram and follow the explanation of how the bell works.
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