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Saturday March 11th 1876

    Capsule
  1. Mr. Watson completed the Receiving Instrument shown in Fig I this afternoon. C is a wooden capsule. SS' a steel spring armature. E Electro-magnet. NN' a hollow iron cylinder within which the electro magnet E is placed. PP' the core. The pole P is positively magnetized - the circular rim NN' negatively charged.
    The instrument was tried this afternoon and no audible effect was heard at A.

  2. The capsule C was removed and the ear applied directly to the spring S,S', a clear sound was perceptible. These experiments were made with a tuning fork as shown in Fig 2 page 43. The above instrument taking the place of the Receiver S (Fig 2 page 43).
Noted by A.G.B.
March 12th 1876
M.G.H. March 12 1876
[PrevPage] [Next] [INDEX ]  Volume 1   11 Mar. 1876    Page 46  [Source] [ NOTES ]