Examination of the Telegraphic Apparatus and the Processes in Telegraphy |
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acoustic Answer armature automatic axis bathometer battery cent circuit compound wire conductivity conductors constructed copper cost Digney frères distance dots electric telegraph electro-magnet embossing employed employés English needle system florins Francs galvanized iron wire galvanometer graph hour Huacho Hughes apparatus hundred improvement inch instru insulator invention inventor Kassala kerite length letter magnet ment Messrs minutes mode modification Morse apparatus Morse code Morse instruments Morse system number of dispatches Number of messages offices operator original Morse paper Paris pen lever poles pounds per mile practical preparation printing wheel Prussia punched-paper process railway ratchet-wheel ratus receipts recording relative strength relay result SAMUEL F. B. MORSE semaphore Siemens & Halske signs sound sounder speed of transmission stations steel submarine tele telegraph apparatus telegraph cable Telegraph Company telegraph wire Thalers tion transmitted tube twenty words type-wheel United United Kingdom weight per mile William Fothergill Cooke wire rope
Popular passages
Page 10 - But be this as it may, the fact, that the magnetic action of a current from a trough is, at least, not sensibly diminished by passing through a long wire, is directly applicable to Mr. Barlow's project of forming an electro-magnetic telegraph;* and it is also of material consequence in the construction of the galvanic coil.
Page 161 - Spirits, at the same time, are to be fired by a spark sent from side to side through the river, without any other conductor than the water; an experiment which we some time since performed, to the amazement of many.
Page 79 - ... Nevertheless it is not easy to determine what ought to be the correct rule for every case. If the river has a straight course, or one nearly so, every man's equities will be preserved by this rule: Extend the line of division between the two parcels from the meander line to the...
Page 24 - I" at one extremity, in order to overcome the inertia of a small shaft, whose duty is to lift the paper up to the type-wheel at the other extremity. This is shown partly in section in Fig. 8. The printing-shaft I, and its continuation i, are locked together by means of a ratchet-wheel I] and click i'.
Page 67 - Table I compares several sizes of galvanized iron wire with the American compound telegraph wire of equal conductivity and a relative strength from thirty to ninety per cent. greater, showing that the compound wire need have only about one-third the weight of galvanized iron wire to be relatively stronger, and at the same time to possess equal or greater conductivity. "It is evident why this should be so, since the best commercial copper possesses more than...
Page 139 - In New Zealand 25 In Tasmania. 7 Total 280 " I do not take into account any other system, as none other is employed on the lines throughout the country. Professor Wheatstone's instruments are employed for local lines between the government offices, &c. ? and are not, so far as I am aware, used on any of the ordinary lines. " Answer 3. I have no hesitation in giving my opinion in favor of the Morse system for all purposes requiring the transmission of large correspondence, where simplicity, accuracy,...
Page 26 - The electric circuits of the apparatus are very simple. The bottom of the vertical shaft Q is connected to earth, and the upper part to one end of the coils of the electro-magnet, the other end being to line. One pole of a battery is connected to the levers k of the contact pins; the other pole to earth. At two corresponding stations the plates of the batteries must always be looking the same way, because the home apparatus is intended always to work as well as that of the distant stations, and the...
Page 26 - ... in the circle K, and when the chariot arrives over the pin, the extremity of the piece r rides over it, separating the earth contact and introducing the battery into the line circuit. The current passes through the vertical shaft, the coils of the magnet, and line wire to the other station, where it circulates in the coils of the magnet, the vertical shaft, &c., and goes to earth. In traversing the coils of the magnets of both instruments, the current weakens the...
Page 54 - ... antimony for the positive pole. The proportions of the zinc and antimony used are, about ninety-six parts antimony and fifty-three parts zinc, as mixed in the melting pot. The pairs are arranged around a central source of heat; and the outer junctions are cooled by radiation and connection. LECLANCHE'S BATTERY. This battery is much in use in the French telegraph administration. It consists of a prism of carbon for its positive pole, which is surrounded by a mixture of peroxide of manganese and...
Page 65 - ... greater, theoretically, than that of a galvanized iron wire, will be much less liable to breakage from these causes, in consequence of the uniformity of strength in the steel core, while, in fact, the relative strength itself of the compound wire is very much the better of the two.