By a curious coincidence the same principle was
enunciated by Sir Charles Wheatstone at the very same meeting; while a
few months previously Mr. S. A. Varley had lodged an application for a
British patent, in which the same idea was set forth. The claims of
these three inventors to priority in the discovery were, however,
anticipated by at least one other investigator, Herr Soren Hjorth,
believed to be a Dane by birth, and still remembered by a few living
electricians, though forgotten by the scientific world at large, until
his neglected specification was unexpectedly dug out of the musty
archives of the British Patent Office and brought into the light.
The announcement of Siemens and Wheatstone came at an apter time than
Hjorth's, and was more conspicuously made. Above all, in the affluent
and enterprising hands of the brothers Siemens, it was not suffered to
lie sterile, and the Siemens dynamo-electric machine was its offspring.
This dynamo, as is well known, differs from those of Gramme and
Paccinotti chiefly in the longitudinal winding of the armature, and it
is unnecessary to describe it here. It has been adapted by its inventors
to all kinds of electrical work, electrotyping, telegraphy, electric
lighting, and the propulsion of vehicles.
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