. Radiography, X-ray therapeutics and radium therapy . Fig. 1). — Dreadnoughl interrupter showing , Container. F, Shaft bearing. B, Jet. C, Contact , Screw. II, Oil cups. K, .Motor brushes. open for a few moments in order to expel the air. This tap is thenclosed and the other connected to the gas supply left open, and advantagetaken of the pressure from the mains. If there is no handy gas supply agas bag may be used or ether vapour. The latter may be employed byvaporising a small quantity of methylated ether placed on the top l themercury and starting the interrupter with a smal
. Radiography, X-ray therapeutics and radium therapy . Fig. 1). — Dreadnoughl interrupter showing , Container. F, Shaft bearing. B, Jet. C, Contact , Screw. II, Oil cups. K, .Motor brushes. open for a few moments in order to expel the air. This tap is thenclosed and the other connected to the gas supply left open, and advantagetaken of the pressure from the mains. If there is no handy gas supply agas bag may be used or ether vapour. The latter may be employed byvaporising a small quantity of methylated ether placed on the top l themercury and starting the interrupter with a small current before closingthe taps. 20 RADIOGRAPHY. Fig. 16. — [nstanta interrupter. In the Instanta interrupter and others there is an arrangement of fourjets so that eight makes and breaks are obtained per revolution, and it is also so arranged that the circuit is broken intwo different places at the same has the effect of greatly increasingthe suddenness of the interruption. Sanax Interrupter. — The Sanaxinterrupter consists of a small steel pear-shaped bowl mounted direct to the axleof an electric-motor and situated perpen-dicularly above the motor. Thus, when^ the axle of the motor rotates, the pear-{^^2> shaped bowl is rotated also. Inside thebowl a very small quantity of mercury(only 10 oz. weight) is placed, and, bycentrifugal force, travels up the side ofthe bowl until it finds the extreme peri-phery, where a distinct groove or bed ismade to receive it. Thus it will be seenwe have a revolving bowl and in it arevolving ring of mercury. Inside theinterrupter bowl and carried on a verticalspindle is a fibre dis
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