LITMIR.BIZ

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CHANGE AND ENERGY

       Fig. 160. The electrodes are made of loops of platinum wire sealed in glass tubes.

       Fig. 161. Water can be separated into two gases by a current of electricity.

       Fig. 162. Filling a balloon with hydrogen.

       Fig. 163. Adding more acid without losing the gas.

       Fig. 164. Trying to see if hydrogen will burn.

       Fig. 165. Filling a bottle with oxygen.

       Fig. 166. The iron really burns in the jar of oxygen.

       Fig. 167. The water rises in the bottle after the burning candle uses up the oxygen.

       Fig. 168. The Bunsen burner smokes when the air holes are closed.

       Fig. 169. Regulating the air opening in a gas stove.

       Fig. 170. The air openings in the front of a gas stove.

       Fig. 171. Why doesn't the flame above the wire gauze set fire to the gas below?

       Fig. 172. The part of the match in the middle of the flame does not burn.

       Fig. 173. The silver salt on the paper remains white where it was shaded by the key.

       Figs. 174 and 175. Where the negative is dark, the print is light.

       Fig. 176. The copper and the nickel cube ready to hang in the cleansing solution.

       Fig. 177. Cleaning the copper in acids.

       Fig. 178. Plating the copper by electricity.

       Fig. 179. The explosion of 75 pounds of dynamite. A "still" from a motion-picture film.

       Fig. 180. Diagram of the cylinder of an engine. The piston is driven forward by the explosion of the gasoline in the cylinder.

       Fig. 181. The most powerful explosions on earth occur in connection with volcanic activity. The photograph shows Mt. Lassen, California, the only active volcano in the United States.

       CHAPTER ELEVEN

       SOLUTION AND CHEMICAL ACTION

       Fig. 182. Etching copper with acid.

       Fig. 183. Strong acids will eat holes like this in cloth.

       Fig. 184. The lye has changed the wool cloth to a jelly.

       Fig. 185. Making a glass of soda lemonade.

       CHAPTER TWELVE

       ANALYSIS

       Fig. 186. The platinum loop used in making the borax bead test.

       Fig. 187. Making the test.

       Fig. 188. The white powder that is forming is a silver salt.

       Fig. 189. The limewater test shows that there is carbon dioxid in the air.

       APPENDIX

       A. The Electrical Apparatus

       Fig. 190. Electrical apparatus: At the right are the incoming wires. Dotted lines show outlines of fuse block. A , 2 cartridge fuses, 15 A; B , 2 plug fuses, 10 A; C , knife switch; D , fuse gap; E , snap switch; F , H , lamp sockets; G , flush switch; I , J , K , nichrome resistance wire, No. 24 (total length of loop, 6 feet) , passing around porcelain posts at left.

       B. Construction of the Cigar-box Telegraph

       Fig. 191. The cigar-box telegraph.

       INDEX

       CONSERVATION SERIES

       Conservation Reader

       WORLD BOOK COMPANY

       INDIAN LIFE AND INDIAN LORE

       INSECT ADVENTURES

       TREES, STARS and BIRDS

       SCIENCE for BEGINNERS

       NEW-WORLD SCIENCE SERIES

       THE HERO OF THE LONGHOUSE

       CHEMCRAFT

      

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