Handy man's workshop and laboratory . ot try to use a lead-lined wooden tank, as the success of theapparatus depends largely on the cooling effect of the surfacesexposed to the air. For the electrodes, two round aluminium rods ^4 mcn diameterand 6y2 inches long are required. These must be of commer-cially pure aluminium, and not the so-called hard stock oralloy. Fasten to one end of each rod a piece of No. 16 coppei HANDY MAN S WORKSHOP AND LABORATORY 287 wire to serve as a terminal. The best way to do this is to drilla small hole through each rod near one end, and then insert thewire and driv
Handy man's workshop and laboratory . ot try to use a lead-lined wooden tank, as the success of theapparatus depends largely on the cooling effect of the surfacesexposed to the air. For the electrodes, two round aluminium rods ^4 mcn diameterand 6y2 inches long are required. These must be of commer-cially pure aluminium, and not the so-called hard stock oralloy. Fasten to one end of each rod a piece of No. 16 coppei HANDY MAN S WORKSHOP AND LABORATORY 287 wire to serve as a terminal. The best way to do this is to drilla small hole through each rod near one end, and then insert thewire and drive down the aluminium with a center punch untilthe wire is tightly pinched. (See A, Fig. 227.) The tank itselfalso serves as an electrode, so that it is necessary to solder a wireto it somewhere on the outside. The aluminium rods are bestsupported in the tank by means of a light wooden frame madeof six pieces as shown at B, into which the rods may be clampedby thin wooden wedges driven in where they pass through theholes. /3£ +- + -{. Fig. 227—The sheet-lead tank To make up the liquid for the cell, put two pounds of crystal-lized sodium phosphate in the tank, and fill up the latter withabout one gallon of lukewarm (not hot) water or enough to fillit to an inch from the top. Stir with a stick until the salt isdissolved, and then adjust the aluminium rods so that they dipinto the solution three inches. Before the apparatus can be set at work the rods must becoated with a film of oxide. This has to be formed by the alter-nating current itself, for which purpose the rods may be tem-porarily connected to the no-volt power mains as shown in the 288 HANDY MAN S WORKSHOP AND LABORATORY first diagram in Fig. 228. A resistance, R, of about ten ohmsmust be used to prevent too much current from passing at half a minute this resistance may be gradually reduced tozero, and the operation will be completed. For actual service the autotransformer, rectifying cell andstorage batter
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