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- One cell upon primary circuitno battery upon secondary circuit. S.
vibrated visibly producing a musical note as loud as in Exp. 5
- One cell upon each circuit.
Arrangement otherwise as in (Fig 6). Poles of electro-magnets opposed to
one another. Sound at S about the same loudness as that mentioned in Exp.
5.
- Arrangement as in Exp. 9 save that
like poles are presented to one another. Sound at S (
Fig 6) same as in Exp. 9.
- Arrangement similar to that in Fig 6.
save that two cells of battery were placed upon the secondary circuit.
The
poles of MM' were opposed as in Fig 7.
Sound
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 Volume 1  |
 22 Feb. 1876
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 Page 20 
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