Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    468/502 page 448
    bell, and for this purpose is rapidly superseding the old mechanical arrangement. It is also of great value as an Stat.I Statu Fic. 143. alarm bell. In this bell an automatic make and break is used, which as long as the main circuit is closed causes the continuous ringing of the bell. The arrangement is seen in Fig. 144. When the circuit is closed the armature is attracted, an adjustable contact at c is broken, and the current flow is stopped. Hence there will be no longer magnetic attraction. and the armature will spring back only to again complete the contact at c ; attraction of the armature for a second time ensues, followed by a second breaking of the circuit. The
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