er case. The double cells in which the elec- mechanically perfect, and well worth the price asked | trodes are placed is made of insulating acid-proof ma- lishment of an electrical plant in any school without for them. One style sells for $1, another for $1.50. | terial, and the copper plate which… … mutator cylinder by a rubber band sur- mordant; if the latter is too strong, the color rounding both of the springs. is fixed too slowly, and there is a loss of color- The battery in the base of the motor ing matter, but if too weak, the color goes ONE DOLLAR ELECTRIC MOTOR. consists of a copper…
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