. The principles and practice of roentgenological technique . ft of themotor converter or when the alternating cur-rent is used on the shaft of the self-startingsynchronous motor. These high tensionrectifying devices must be correctly adjustedin relation to the motor armature or to thecycles of A. C. current. There are generally speaking two types ofrectifying devices the disc and the are similar in their action. Disc Coiiuiiiitation: This consists of around micanite disc. To the periphery of thisdisc are fastened copper strips, opposite eachother, and occupying a little more than aqu
. The principles and practice of roentgenological technique . ft of themotor converter or when the alternating cur-rent is used on the shaft of the self-startingsynchronous motor. These high tensionrectifying devices must be correctly adjustedin relation to the motor armature or to thecycles of A. C. current. There are generally speaking two types ofrectifying devices the disc and the are similar in their action. Disc Coiiuiiiitation: This consists of around micanite disc. To the periphery of thisdisc are fastened copper strips, opposite eachother, and occupying a little more than aquarter of the circumference. The collectorbrushes are mounted on bakelite supportpieces to prevent creepage. They are arrangedto commutate the current and rectify the high-tension alternating current. The alternatingcurrent enters, so to speak, at two oppositecontacts, and the rectified current is takenfrom the two remaining contacts and con-ducted by the outlet terminals. Figure 35 gives a diagrammatic idea of therectifying device. F is the mica disc, G ^ B. Fig. 35.—Diagrammatic scheme of rectifying device. and H are two copper commutator stripsfastened to the periphery of the disc, andplaced opposite each other. J and K are high-tension alternating current brushes which receive the discharge from the trans-former through leads 1 and 2. L and M are the brushes which receive the recti-fied current and 3 and 4 are conduits whichlead it to the tube. For one complete cycle,or two alternations, the disc makes half arevolution. ^-K^^
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
