. The principles and practice of roentgenological technique . ed 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 results in the demagnetizationof the core. The spring is then released and theend of the platinum points again come in con-tact and the circuit is made. Th
. The principles and practice of roentgenological technique . ed 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 results in the demagnetizationof the core. The spring is then released and theend of the platinum points again come in con-tact and the circuit is made. This may berepeated depending on the mechanical patternfrom thirty to two hundred and sixty timesper second. Mechanical interrupters may be constructedto carry heavy currents and give a high rateof interruptions according to the principle asabove described. The interrupter action takesplace however in an accessory small coil orindependent electro-magnet, specially wound,and it is only the interrupted primary, whichis carried to the core of the induction Fic. 25.—Mechanical break, activated b\- a winding-less motor. The contacts in such interrupters should havelarge faces placed parallel, and be of platinumor tungsten. In one modern form of mechanical breakthe contact points are activated by a winding-less motor, which causes the make and breakby an eccentric acting on one of the motor is driven by the make and breakof the magnetic field, produced in a coil whichis connected across the break gap. The fre- quency of interruptions is easily interrupter may be used either with director alternating current and draws from five toseven amperes. It gives a discharge fairly freefrom inverse. It is an excellent form for pro-longed use with small currents, as in fluoro-scopy. MERCURY INTERRUPTERS In this type the current is interrupted be-tween electrodes—a moving or stationarv
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
