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. 1892 edition. Excerpt: ...equally in flowing around the wheel. Equal currents being thus applied to opposite sides of the latter, it remains at rest. Half the current, however, passes through the line, and, reaching the receiving instrument at B, passes around the wheel there on one side, and out through the stopcock b; or, if a small ...
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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. 1892 edition. Excerpt: ...equally in flowing around the wheel. Equal currents being thus applied to opposite sides of the latter, it remains at rest. Half the current, however, passes through the line, and, reaching the receiving instrument at B, passes around the wheel there on one side, and out through the stopcock b; or, if a small part of it passes to earth through the artificial line (and this will always be the case), it goes in such a way as to aid, and not to oppose, the movement of the wheel. Thus a signal will be received at B which will be interpreted as a dot or a dash, according as the time of motion is short or long. Of course, the transmission of a signal from B to A is accomplished in precisely the same way. If both stopcocks are opened at the same moment, it will easily be seen that the two equal opposing currents in the line will prevent any actual flow, and at each end flow will take place only into the artificial line, and signals will be recorded at both. It is also clear, that if the operator at B, wishing to send a dash when only a dot is to be transmitted from A, shall continue to hold his key open after the other is closed, the balance will be at once established at B, the wheel will cease to move, and a dot will be recorded; while the current from B, now flowing through the line, will maintain the motion at A until a dash is registered there. It has already been stated that duplex telegraphy was not practically successful until after the introduction of the "condenser" by Mr. Stearns. The necessity for its use grew out of the existence of a difficulty which is experienced in a greater or less degree in all electric telegraphy; and, as frequent reference to it will be necessary in the future, it will be desirable to explain its origin and effect...
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Add this copy of A Century of Electricity to cart. $38.99, fair condition, Sold by Resource Books, LLC rated 5.0 out of 5 stars, ships from East Granby, CT, UNITED STATES, published 1887 by Houghton Mifflin.
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Seller's Description:
Fair. Boston: Houghton Mifflin, 1887. First edition, 1887. A but worn but sound. Illustrated with engravings. Golden tan cloth lettered and decorated in black and gilt. Covers rubbed and spotted, good hinges, sound but not firm text block, front free endpaper detached, pages a bit age-yellowed but clean, transparent stains to outer margins of pages in the index, no names or other markings. First Edition. Hard Cover. Fair. 12mo-over 6¾"-7¾" tall.
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