de la Rive states that flames change their shapes when brought near the poles of an electro-magnet. If this is so a vibratory current of electricity should impart a vibratory motion to the flame placed near to the poles of an electro-magnet on circuit.

Fig 5 shows one form of Flame-galvanometer for the Undulatory current. The flame F is merely placed between the poles S, N of an electro- magnet or circuit.

Figs 6 and 7 show new experimental transmitter consisting of a sounding-board upon which is the coil (C). A permanent magnet NS is supported in a block of india-rubber (I) It is presumed that a sound made near the sounding board will set it in vibration -- that the coil I will vibrate with it and that the inductive action of the magnet NS will occasion electrical undulations in the coil.

Volume 1

23 Feb. 1876

Page 29