Rühmkorff coil by E. Leybold’s Nachfolger, c. 1905
On application
A Rühmkorff’s induction coil with Vrill interrupter. Made by E. Leybolds Nachfolger, Coln am Rhein, Germany, and imported by P.J. Kipp & Zonen of Delft, Holland. All parts are detachable and all connections arevisible. The iron core, the primary and the condenser can be removed and the action of these parts can clearly shown.
The Vrill interrupter is a modified platinum contact-breaker with a second spring. The primary circuit can be suddenly broken. Owing tot his prolonged period of contact the iron core is magnetised up tot he saturation limit, whereby a considerably greater electromotive force is induced than in the case of the simple contact-breaker. The longer is the time during which the circuit is closed, an the more sudden is the interrepution. In this way the intensity of the discharge can be adapted tot he condition of the tubes in experiments with Röntgen rays. The Vril interruptor is, moreover, superior tot he ordinary contact-breaker inasmuch as the platinum contact undergoes less heating and less wear.
The full description can be read in the catalogue of Physical Apparatus with descriptions and instructions for use of E. Leybolds Nachfolger Cologne Germany of 1905 on page 227-299.
