The Turn Of The Century Electrotherapy Museum
(C) Jeff Behary 2011 

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A Description of an Electro-magnetic Repeater,
or of a machine by which the connexion between the
Voltaic Battery and the helix of an Electro-magnet may be
broken and renewed several thousand times in the space of
one minute.
Rev. N. J. Callan

(C) Jeff Behary, 2011