. The principles and practice of roentgenological technique . minimizethe current induced at the make, which is in-verse and undesirable. It also tends to mini-mize the self-induction in the primary of thecoil whose effects are visibly shown in theprimary circuit by sparking at the interruptercontacts. With the coil working in unisonwith the interrupter with a high number ofbreaking current impulses per second in a cur-rent of sufficient tension and intensity, the con-denser becomes unnecessary, as in the electro-lytic interrupters. INTERRUPTERS In order to obtain the maximum inductiveeffects
. The principles and practice of roentgenological technique . minimizethe current induced at the make, which is in-verse and undesirable. It also tends to mini-mize the self-induction in the primary of thecoil whose effects are visibly shown in theprimary circuit by sparking at the interruptercontacts. With the coil working in unisonwith the interrupter with a high number ofbreaking current impulses per second in a cur-rent of sufficient tension and intensity, the con-denser becomes unnecessary, as in the electro-lytic interrupters. INTERRUPTERS In order to obtain the maximum inductiveeffects in a coil the primary interruptions mustbe rapid, regular and short. If a current of 30 amperes is reduced to 0in .03 seconds, the current has changed at therate of 1000 amperes per second. If it re-quires .06 seconds to do this, the change takesplace at the rate of 500 amperes per secondary voltage has therefore only halfthe value under the latter conditions. There are three varieties of interrupters: 1. Mechanical. 2. Mercury. 3. Fig. 24.—Plan of a winding of coil and connectionto condenser and mechanical break. MECHANICAL INTERRUPTER. (, 25.) Parts: 1. Core of primary of coil. (A) 2. Hammer, which consists of a metal strip, act- ing as a spring, to which is fastened apiece of soft iron. (B) 3. Contacts, consisting of two platinum points, one fastened to spring (C) and one to anadjustable screw horizontally placed. (D) The hammer is so placed that the soft ironis just opposite the core. The spring holdsthe platintim tips in contact. One end of thecircuit is attached to the adjttstable screw, theother end extends to the primary of the current flows through the adjustablescrew, through the platinum points, held incontact by the spring, into the primary of thecoil. The iron core becomes magnetic anddraws the piece of soft iron to itself, separat-ing the platinum contacts and interrtipting the MECHANICAL INTERRUPTER 27 current, which re
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
