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 Volume 1  |
 27 Mar. 1876
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 Page 80 
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When S was plucked with the finger the sound was steadily audible
from R'.
- When sounds were sung into z of R' the notes were audible from R.
- A spring S was fastened to a stretched membrane M + an electro
magnet E fastened over it. Circuit as in Fig 5.
Upon singing into A the sounds were heard from z or R' + upon
singing into z or R' the sounds were audible from A. The word
"papa" uttered into z was intellig-
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 Volume 1  |
 27 Mar. 1876
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 Page 80 
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