A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . n blue) is formed at the point ofcontact of the iron stylus p with the paper, the iron of the compound being supi)lie(l bythe stylus itself. The paper is carried on by ordinary mechanism ; and a dot and dashalphabet is formed, according to the duration of contacts at the sending station. There isa single wire and a double wire code ; and the signals appear as deep blue marks upon thepaper. Supplies of paper saturated with the solution are kept in reserve. This i
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . n blue) is formed at the point ofcontact of the iron stylus p with the paper, the iron of the compound being supi)lie(l bythe stylus itself. The paper is carried on by ordinary mechanism ; and a dot and dashalphabet is formed, according to the duration of contacts at the sending station. There isa single wire and a double wire code ; and the signals appear as deep blue marks upon thepaper. Supplies of paper saturated with the solution are kept in reserve. This is unques-tionably a telegraph of extreme simplicity. It has been employed with much success. Mr. Whitehouse prepared for the Atlantic Telegraph a system in which motion anilchemical action each play their part. The .secondary currents that he em])loyed were notable to produce the chemical decomposition that he reipiires for his signals. He thereforereceived them in a very sensitive relay, either an electro-magnet or a multiplier. The relaywas a contact-maker, and connected the necessary number of local batteries with the print-. 508 ELECTRO-TELEGRAPHY. ill apparatus, which consists of a ribbon of paper, saturated with a thenueul suUitioii, andpassing between a drum and a steel point. We should exceed our limits, were we to attempt the description of some of tlie manyother forms that have been proposed. The above are good illustrations of the leading prin-ciples, and are all in successful use. Some telegraphs will print in ordinary characters;this result is only attained by much complexity; and its value is more than questionable, itbeing as ejii^y to learn a new code as a new alphabet; and telegraph clerks read their sig-nals as readily as they read ordinary writing or printing, and tliey acquire their knowledgein a very short time. Hence, probably, it is that telegraphs to print in ordinary charactersarc but little known in real practice ; nevertheless, some very promising ins
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
