. "Roentgen" induction coils and other X-ray apparatus . s O. BidUle, 1114 Chestnut Street, Philadelphia. being returned to the factory. All the parts of the interrupter arestandardized and can be renewed at any time as we keep a stock ofparts on hand. Long Life of A long life of all the parts has been made an es- Parts. pecial feature. The ones subjected to the greatestwear are of course the contacts. But they have been made unusuallylarge and of the very best Iridio-Platinum obtainable. Aside from thecontacts, the only parts which may need renewing are the springs,which once in a great while
. "Roentgen" induction coils and other X-ray apparatus . s O. BidUle, 1114 Chestnut Street, Philadelphia. being returned to the factory. All the parts of the interrupter arestandardized and can be renewed at any time as we keep a stock ofparts on hand. Long Life of A long life of all the parts has been made an es- Parts. pecial feature. The ones subjected to the greatestwear are of course the contacts. But they have been made unusuallylarge and of the very best Iridio-Platinum obtainable. Aside from thecontacts, the only parts which may need renewing are the springs,which once in a great while crystallize and break under the strain ofconstant bending. The contacts should last for a year with constant use, while thesprings are likely never to need renewing. In short we recommend the Roentgen Self-Starting Me-cKanical Interrtipter as the most efficient, most reliable, andmost satisfactory of the various mechanical interrupters which areoffered to-day. Roentgen Self=starting Mechanical Interrupter $ Interrupter and Figure 7. Roentgen SeIf=Starting Mechanical Interrupterand Adjustable Condenser, with Switches. Tij COMPLETE interrupter with adjustable condenser and switchesKA as shown can readily be adapted to coils whose operation is ^^ rendered unsatisfactory because of the inefficiency of the in-terrupter. The output of an induction coil, operated by the ordinarymechanical interrupter, can be materially increased if the RoentgenMechanical Interrupter be used in its place. James Q. Biddle, 1114 Chestnut Street, Philadelphia. Interrupter and The interrupter is of the well-known self-startingCondenser. type and has a current carrying capacity of up to 10 amperes on the 16 volts 20 volts or no volts direct current. Thecondenser is adjustable and of the best mica insulation, assembled bya process that excludes all air from the condenser and insures maxi-mum ^ If h ^^^ indicating snap switch at the extreme right is the Interrtipte
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