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. 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.
Fig. 186. The platinum loop used in making the borax bead 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.
B. Construction of the Cigar-box Telegraph
Fig. 191. The cigar-box telegraph.
THE HERO OF THE LONGHOUSE