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Excerpt from Journal of the Society of Telegraph Engineers, Vol. 4: Including Original Communications on Telegraphy and Electrical Science; 1875 In the very early stage of electro-magnetic experiments it had been suggested that an instantaneous telegraph might be con structed by means of conjunctive wires and magnetic needles. The details of this contrivance are so obvious, and the principles upon which it is founded are so well understood, that there was only one question which could render the result doubtful. This was, whether by lengthening the conjunctive wires there would be any diminution in the electrical effect upon the needle. Had it been found true that the galvanic fluid could be transmitted in a moment through a. Great extent of conducting wire without diminishing its magnetic effect, then no question could have been entertained as to the practicability and importance of the suggestion adverted to above with regard to the telegraph. Mr. Barlow, of, the Royal Military Academy (at Woolwich), who has made a number Of successful experiments and investigations in electro magnetism, fully ascertained that there was so sensible a diminu tion with only 200 feet of wire as to convince him at once of the impracticability of the scheme. There can belittle doubt that this published Opinion of so emi nent a man as Professor Barlow, which occurs in the Philosophical Transactions, had the effect of retarding the introduction of electric telegraphs by many years. In the same year Ohm published the celebrated mathematical formulae which bear his name, and had they been known and duly appreciated at the time they would at once have dispelled all mis givings as to the distance at which electrical effects might be rendered sensible. They were not however translated into English until 1841. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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