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37

          Monday Dec. 5-1881.

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[[annotation in top of left margin]] Exps. S.T. [[/annotation in left margin]] 
before; & this time no sound was produced.  I then tried holding C. sometime between my fingers, and found that this produced quite a loud musical sound in the telephone when it was again connected to B.
    A copper, and a German silver wire were then twisted together for about a length of an inch, and connected in circuit with the telephone and rheotome.  When the twisted joint was heated by placing a bunsen flame near it quite good sound was emitted by the telephone which increased regularly in loudness as the wires increased in temperature, until the wires were red hot when the sound emitted by the telephone could be heard at least one foot from the [[strikethrough]] inv [[/strikethrough]] instrument.
    A thermo-electric pile was then connected in the circuit, and a good sound obtained when it was three feet distant from the bunsen flame.
          Noted by S.T. Dec. 5-1881.

          Tuesday Dec. 6-1881.

[[annotation in left margin]] Thought. S.T. [[/annotation in left margin]] 
    How about the following arrangement for an induction balance? 

[[image:  diagram of apparatus labeled with capital letters A, B, C, D, E, F and annotations]]
Telephone
Rheotome
Battery
[[/image with annotations]]

    A. D. two flat coils of insulated wire arranged in opposite sides of Wheatstone bridge ^[[and]] so that the current passes in the same direction through both.
    B. C. resistance coils equal in resistance to A & [[overwritten]] B [[/overwritten]] D. respectively.
          Noted by S.T. Dec. 6-1881 --
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