. Radiography and radio-therapeutics . arry up to 50 amperes, and are provided with two motors, one being u RADIOGRAPHY used to ensure perfect synchronism. They give practically the same out-put as those which are used on a continuous current circuit. The mercury jet is obtained, as in some of the previous interrupters,by the rotation of a cone with its lower end in mercury, and by centrifugalforce the mercury is jetted out against the stationary contacts. The motorpart differs from the continuous current interrupter. The break is startedwith a smart twist of the milled head on top and the nee
. Radiography and radio-therapeutics . arry up to 50 amperes, and are provided with two motors, one being u RADIOGRAPHY used to ensure perfect synchronism. They give practically the same out-put as those which are used on a continuous current circuit. The mercury jet is obtained, as in some of the previous interrupters,by the rotation of a cone with its lower end in mercury, and by centrifugalforce the mercury is jetted out against the stationary contacts. The motorpart differs from the continuous current interrupter. The break is startedwith a smart twist of the milled head on top and the needle of the milli-ammeter watched until this is steady, this indicating that the interrupteris in synchronism with the supply. Some operators can judge of this bysound,synchronism is attained At first there is a grating sound, and this becomes smooth when Methods of dealing with Inverse Current The apparatus already described consists of the induction coil workingwith either a mercury or electrolytic interrupter. The chief objection to. Fig. -Rectipulse outfit with front removed to show arrangement of parts.(Watson & Sons.) this combination is the presence of reverse current in the circuit, necessitat-ing the use of valve tubes for its suppression. Leslie Miller succeeded inchecking the reverse current by the introduction of a mica disc has also introduced a rectifier which gets rid of the reverse Davidson has suggested an ingenious apparatus for the utilisationof the reverse. Gunstone in the Rectipulse apparatus deals with the reverse currentin a different manner ; by a mechanical device attached to the interrupterhe diverts the current which appears at the make so that it moves inthe same direction as that of the current at break, and therefore supple-ments it instead of antagonising it. This result is produced by the primarybeing arranged in such a way that the magnetisation of the iron core isreversed in sign at each successive impulse. It
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