Telegraphic Journal and Monthly Illustrated Review of Electrical Science, Volume 1Electrical review, Limited, 1872 |
Contents
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Common terms and phrases
acid action amount apparatus application armature arrangement battery block system carbon cause cells cent charge circuit coil communication condenser conductor connected constant constructed copper corresponding deflection diameter direction disc discharge distance Ditto earth effect elec electric current electric resistance electro-magnet electrodes electrolysis electromotive force elements employed equal experiments Fleeming Jenkin galvanic galvanometer give given glass gutta-percha heat Hooper's Telegraph hydrogen inches increase instrument insulated intensity iron length letter lever Leyden jar light Limited liquid logarithms machine magnet magnetised means measure ment mercury messages metal method miles needle negative Northern Telegraph Company obtained ohms ordinary paper passing placed plate platinum poles positive potential produced proportional quantity railway received relay resistance shares Siemens signal solution station strength student sulphate surface tele Telegraph Company TELEGRAPHIC JOURNAL temperature tension tion tricity tube unit vessel wire zinc ΙΟ
Popular passages
Page 49 - ... and to Sir W. Thomson belongs the credit of having established the fact by experiment, irrespective of his theoretical deductions from the facts of thermo-electricity. He thus describes his decisive experiment : — " A metal bar insulated so as to be movable about an axis perpendicular to the plane of a metal ring made up half of copper and half of zinc, the two halves being soldered together, turns from the zinc towards the copper when positively electrified, and from the copper towards the...
Page 266 - Remembrancer, and Guide to Candidates for Employment in the Telegraph Service. By R. BOND. Fourth Edition, revised and enlarged : to which is appended, QUESTIONS on MAGNETISM, ELECTRICITY, and PRACTICAL TELEGRAPHY, for the Use of Students, by W. MCGREGOR, First Assistant Superintendent, Indian Gov.
Page 256 - This tube is then hermetically sealed, and the machine being set in motion by means of a small steam-engine, the charcoal becomes gradually and equally heated, and emits a soft, steady, and continuous light, which, by a most simple contrivance, can be strengthened or weakened at the option of those employing it, its duration being dependent solely on the electric current, which of course will last as long as the machine is kept in motion. Taking into consideration the fact that one machine, worked...
Page 76 - To ensure that temperature was in no way affecting the experiments, one of the bars was placed in a trough of water so that there was about an inch of water for the light to pass through, but the results were the same; and when a strong light from the ignition of a narrow band of magnesium was held about nine inches above the water, the resistance immediately fell more than twothirds, returning to its normal condition immediately the light was extinguished.
Page 168 - A person has two horses, and a saddle worth £50 ; now, if the saddle be put on the back of the first horse, it will make his value double that of the second ; but if it be put on the back of the second, it will make his value triple that of the first ; what is the value of each horse ? Ans.
Page 50 - I now think it quite certain that two metals dipped in one electrolytic liquid will (when polarization is done away with) reduce two dry pieces of the same metals when connected each to each by metallic arcs to the same potential...
Page 52 - What is necessary to determine here is the distribution of the magnetism in the magnet, both before and after the application of the contact, this is a question with which I have long occupied myself, and on which I will now say a few words. I study this distribution by two mutually corroborative processes. The first consists in placing upon a point of the magnet a small electromagnet of soft iron enveloped in copper wire which...
Page 84 - The replenisher consists of two properly shaped pieces of " metal called inductors, which are fixed in the neighbourhood " of a carrier-wheel such as that described above, and four fixed " springs touching the carriers at the ends of two diameters. " Two of these springs (called receiver-springs) are connected " respectively with the inductors; and the other two (called " connecting springs) are insulated and connected with one " another (one of the inductors is generally connected with the " earth,...
Page 83 - Electro-statics and Magnetism," which runs : — " Holtz's now celebrated electric machine, which is closely analogous in principle to Varley's of 1860, is, I believe, a descendant of Nicholson's. Its great power depends upon the abolition by Holtz of metallic carriers and metallic make-andbreak contacts. It differs from Varley's and mine by leaving the inductors to themselves, and using the current in the connecting arc.
Page 168 - J in the mud, } in the water, and 10 feet above the water; what is its whole length ? Ans.