. Dental electro-therapeutics. n and the last zinc unconnected, to eachof these attach a wire two yards long but let the first wirebe blue and the last be red to distinguish them. The wirefrom the first carbon will be the positive pole and the otherthe negative pole of the battery. Place the box in the left-hand corner of the shelf in the lower portion of the cabinetand bore two holes an inch apart about 6 inches above thecells in the back of the cabinet, through these holes passthe two wires. Get a neat polished board of the samewood as the cabinet made in the form of a shallow tray(5 inch de
. Dental electro-therapeutics. n and the last zinc unconnected, to eachof these attach a wire two yards long but let the first wirebe blue and the last be red to distinguish them. The wirefrom the first carbon will be the positive pole and the otherthe negative pole of the battery. Place the box in the left-hand corner of the shelf in the lower portion of the cabinetand bore two holes an inch apart about 6 inches above thecells in the back of the cabinet, through these holes passthe two wires. Get a neat polished board of the samewood as the cabinet made in the form of a shallow tray(5 inch dee])), to fit the side of the cabinet which is nearestto the operator as he stands by his chair; to this board BATTERIES 95 first assemble a milliamperemeter, shunt rheostat, currentreverser, and two screw terminals with the poles markedon them. These all have contact screws which pass throughthe board to the tray-like surface at the back where theconnections with the battery are made with insulated wirein the following manner:. Fig. 33.—Switchboard with parts assembled. To the — terminal connect the red wire from the battery. To the distal end of the contact rheostat attach the bluewire, connect the other end of the rheostat with one uprightof the milliamperemeter and from the other upright takea wire to the + terminal screw. The battery is now com-plete but for a current reverser which can easily be includedif desired but which makes this description a little morecomplicated, and has not been included in the description,which it is desired to make as simple as possible. The board,when the several parts are connected up, is screwed ontothe side of the cabinet, and the outfit is a fixture from 96 MAGNETIC FIELD, CURRENTS AND BATTERIES which the current can be switched on at will. Such a bat-tery will supply current for ionization, gold plating, andmany kinds of work for which an ordinary continuouscurrent is desired in dental practice. The cells last about eighteen months or
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