Summarized Proceedings and a Directory of Members Volume 3-4 by American Association for Science
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Author: American Association for Science
Page Count: 238 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: PDF
ISBN: 9781130844627
File size: 37 Mb
Download Link: Summarized Proceedings and a Directory of Members Volume 3-4
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 Excerpt: ...disc, coloring the paper in its passage by the partial decomposition of the ferrocyanate. Walker has made a series of experiments with this telegraph between Boston and New York.f But although the pass-time is here avoided, other sources of error are introduced. The times of delay and of persistence in the chemical action take the place of the induction and the eductiontimes in the electro-magnet, and a new and serious difficulty presents itself in the spreading of the lines which have undergone chemical action. The character of the electro-chemical telegraph allows no local circuit, in the technical sense of this term, and indeed it is unnecessary, for a current capable of closing a local circuit would suffice to act with energy on the very sensitive salt with which the paper is saturated. But in the experiment for velocity, it is indispensable that a record be kept at the two terminal stations, at least; and tjie closing of the circuit, in order to record at one station, necessarily diverts the current from the other. With a powerful battery a record may be successfully kept at stations no further distant than New York and Boston; but if we use a line as long as that between New York and Buffalo, a battery so powerful as to burn a hole through the paper at one terminus, cannot record signals at the other, when the circuit of the signal-station is closed. Mr. Bain has ingeniously remedied this difficulty by using a short circuit at the signal-station, which is closed by the same key that closes the main circuit. Yet even this still introduces a new source of uncertainty. A curious result which Mr. Walker has deducedf from his experiments consists in the fact that the discolored lines, which measure the duration of the current, are longer at the station whe...
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