. Electrical instruments and telephones of the Signal corps . ^the operation of the home transmitter. Operation of yole changer.—In figures 48 and 49 apparatus isshown for reversing the direction of the current. In those figuresP 6^ is a pole-changing transmitter, commonly termed a polechanger, designed to transpose the position of the poles of the bat-tery as regards the circuit in which it is placed, and consequently toreverse the direction of the current in the circuit. This pole changer P C is of the class known as continuity preserv-ing pole changers, designed to reverse the battery
. Electrical instruments and telephones of the Signal corps . ^the operation of the home transmitter. Operation of yole changer.—In figures 48 and 49 apparatus isshown for reversing the direction of the current. In those figuresP 6^ is a pole-changing transmitter, commonly termed a polechanger, designed to transpose the position of the poles of the bat-tery as regards the circuit in which it is placed, and consequently toreverse the direction of the current in the circuit. This pole changer P C is of the class known as continuity preserv-ing pole changers, designed to reverse the battery with the least 86 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. are piir-. OAAAAA/V- :i± ^ 6 l) break in the circuit. In figure 48 the contact pointsposely separated more widely than is customary in practice. P C consists of a lever L carryin£r the armature A of an electro-magnet E: the latter being controlled by a key, /f, and local bat-tery 1). The leverL is extended asshown, and has aplatinum contactpoint P at the endof the P is an-other contact pointP\ supported byframework, notshown in figures 48and 49 but seen infigure 55. Metalstrips, J. V withplatinum contactpoints are also sup-ported on theframework and piv-• oted as is given a down-ward tendency,fixed rigidl}^ in itsplace. The poles ofbatter} B are con-nected respectivelyto levers I and V, asshown. In figure 48 thepole changer isshown closed. Inthat position thecontact P is in con-tact Avith 7, whileP is in contact with/. This, it will beseen, places the neg-ative pole of bat-tery B to the line,and the current on the line in the direction indicated b}^ the
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
