. Radiography, X-ray therapeutics and radium therapy . means of an ordinaryterminal, and the current is led also to the segment inthe disc by means of the spindle carrying same. Thus,each time one of the copper segments enters into themercury ring the current is allowed to pass, and eachtime the segment leaves the mercury ring and the fibreof the disc enters the ring, there is an interruption the unique construction of working two circlestogether—the mercury ring and the fibre segmenteddisc—a splitting up of the mercury, such as would occurby plunging into the mercury any other form
. Radiography, X-ray therapeutics and radium therapy . means of an ordinaryterminal, and the current is led also to the segment inthe disc by means of the spindle carrying same. Thus,each time one of the copper segments enters into themercury ring the current is allowed to pass, and eachtime the segment leaves the mercury ring and the fibreof the disc enters the ring, there is an interruption the unique construction of working two circlestogether—the mercury ring and the fibre segmenteddisc—a splitting up of the mercury, such as would occurby plunging into the mercury any other form of con-tact, is completely avoided. As already mentioned, the free revolving fibre discwith two copper segments is placed not in the centre of the bowl, buteccentrically, and can be inserted more or less into the mercury ring fromthe outside, even if the motor is running. This arrangement makes itpossible to put the disc so that it just touches the mercury ring, in whichcase the duration of contact is very short. The further the disc is put into. Fig. interrupter. INTERRUPTERS—CAUSES OF DEFECTIVE WORKING 21 the mercury ring the further the segment travels in the mercury, andtherefore the duration of contact can be extended as desired. Moreover,the number of interruptions is regulated by the speed of the motor bya special volt regulator mounted on the switchboard, so that not only isthe duration of contact independent of the number of interruptions, but bothare also independent of the primary current. The Di-electric used in the Sanax interrupter is paraffin. Alcohol,gas, and other di-electrics have been tried, but paraffin has given the bestresults. Before the introduction of the Sanax interrupter the mercury inter-rupters using paraffin as a di-electric, in spite of their numerous advantages,had the great disadvantage of emulsifying the mercury. The cause of thisis not the burning of the same by the opening spark but the mechanicalbreaking up and churning of it
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