. Cassier's magazine. 4OO VOLT ALTERNATING-CURRENT CIRCUIT y vAA/WnA/V FROZEN SERVICEPIPES WATER MAIN overhead conductors, and the leadsW W, which may consist of No. 12 orlarger copper line wire, are connectedto them by a suitable T clamp; or theleads may be simply twisted around theconductors. To facilitate making connections withthe overhead circuits and with the cityhydrants or faucets within the buildings,at least four sections of well insulatedwires, from 100 to 400 feet in length,and of ample capacity to carry the heav- is placed in the bottom of the barrel forone terminal. For the other
. Cassier's magazine. 4OO VOLT ALTERNATING-CURRENT CIRCUIT y vAA/WnA/V FROZEN SERVICEPIPES WATER MAIN overhead conductors, and the leadsW W, which may consist of No. 12 orlarger copper line wire, are connectedto them by a suitable T clamp; or theleads may be simply twisted around theconductors. To facilitate making connections withthe overhead circuits and with the cityhydrants or faucets within the buildings,at least four sections of well insulatedwires, from 100 to 400 feet in length,and of ample capacity to carry the heav- is placed in the bottom of the barrel forone terminal. For the other terminala number of ordinary arc carbons, tiedtogether by the lead wire, are used; orbare wire alone may be used for suchterminals. To increase the conductanceof the water, salt may be added, butthis is not always considered a small vessel is used for thispurpose, copper plates are preierablefor the terminals. These plates areplaced at least 6 inches apart. When THAWING OUT FROZEN PIPES ELECTRICALLY ^9. [N SOME TOWNS A PORTABLE MOTOR-DRIVEN GENERATOR OUTFIT IS USED IN PLACE OFWATER OR OTHER RHEOSTATS heavy currents are passing throughthese rheostats the water may show atendency to boil, which may be pre-vented by the addition of ice or coldwater. By means of the ammeter A in theprimary circuit, the current in the sec-ondary circuit may be calculated, theratio of transformation being in thiscase, say, 40 to 1, and the voltage maybe read from the voltmeter V. Whenbarrel rheostats are used, it is goodpractice to begin with the terminalsabout 30 inches apart, gradually short-ening the gap. It may be added, how-ever, that after considerable experiencein this work with high potentials, someworkers have dispensed with the waterrheostat altogether, owing to the dangerfrom shock connected with its this is done, reliance is placedentirely upon the transformer to reducethe voltage to a fixed standard for allcases met with in ordinary work of thiskind. Reactance co
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