[PrevPage] [Next] [INDEX ]  Volume 1   5 Apr. 1876    Page 92  [Source] [ NOTES ]
    c carried two pieces of pencil lead a b which are metallically connected by a copper wire w.
    The plumbago styles a b dip into mercury MM' contained in two glass cells. The mercury is connected with the battery + line wire by means of two wires d, e.
    In the Receiving Instrument S is a steel-spring attached to a stretched membrane.
    When my father sang into A the sounds were loudly audible at z. Articulate sounds were audible at z when words were uttered into A. Vowel qualities could be discriminated, but not consonant sounds.

  1. Automatic Transmitter arranged as in Fig 2 page 93. Plumbago, P vibrated in mercury. With one cell of batytery B there was a slight visible vibration of S. As the battery power was increased the amplitude of the vibration of S in-
[PrevPage] [Next] [INDEX ]  Volume 1   5 Apr. 1876    Page 92  [Source] [ NOTES ]