Journal, Volume 31874 Vols. 59-95, Dec. 1920-1948 include (1941-48, in pt. 3) Proceedings of the Radio section (as Wireless section, Chairman's address, 1920-40; as Wireless section, Proceedings, 1941-44). |
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action alloy Ampère's law apparatus applied arrangement battery bobbin borer bottom boucherising cable cable-current cells cent centimetres circuit coil condenser conductivity conductor connected constructed copper creosote creosoted poles cylinder decay defence deflection depth diameter direction ditto ditto earth effect electrical resistance electro-magnet electrodes electromotive force elements employed equal experiments explosion fathoms fuses galvanometer German silver gun-cotton gutta-percha heat hole ignition inches increase induction induction coil instrument insulated iridium larch length lever magnetic means measure mechanical metal miles mines moisture needle observed obtained Ohms operations ordinary paper placed plates platinum platinum wire platinum-silver poles portion position Preece preservative produced quantity Railway relay rheostat Ruhmkorff coil ship sinker soil sound specimens submarine surface Telegraph Engineers telegraph poles temperature tension thermometer timber tion torpedo tube units voltameter weight wet rot Wheatstone bridge wire wood
Popular passages
Page 503 - For nearly two years I have felt quite sure that the proper explanation of voltaic action in the common voltaic arrangement is very near Volta's, which fell into discredit because Volta or his followers neglected the principle of conservation of force.
Page 176 - Annual subscriptions shall be payable in advance on the 1st of January in each year; and no subscriber, whose subscription is in arrear, shall be entitled to any privileges as to voting. Committee of Management. 12. For conducting the affairs of the fund there shall be a
Page 504 - If, however, the two metals are plunged together into water, the copper, zinc, and water forming a galvanic cell, all remain at one potential, and no charge of electricity is observed on any part of the system." " If a piece of copper be now joined to the zinc, it (the copper) will become negative, and the other copper plate positive, the difference...
Page 7 - It is not an expression we arc accustomed to. We are accustomed to "terrestrial magnetism ; " we are accustomed to " atmospheric electricity. " The electric telegraph forces us to combine our ideas with reference to terrestrial magnetism and atmospheric electricity. We must look upon the earth and the air as a whole — a globe of earth and air — and consider its electricity, whether at rest or in motion. Then, as to terrestrial magnetism, — of what its relation may be to perceptible electric...
Page 518 - D and S are two known functions which must be rigidly equal to zero when no variation in the system occurs ; and which for any given variation in the system must be as small as possible, and approximate rapidly towards zero as the variation in the system becomes smaller and smaller. Thus the solution of the problem for any given duplex method will always be a question of the Minima and Maxima Calculus.
Page 171 - The general outline of the rest of Mr. Schwendler's commmunication will be best given in extracts from his paper, which will be printed in full in Part II. of the Journal. Mr. Schwendler says : — " The currents observed at all hours of the day and all seasons of the year, in every line throughout India, may be obviously due to many different causes acting separately or conjointly. These currents I have designated - natural currents,' to indicate the fact of their being in the lines without any...
Page 42 - So also must our electrical defences be safe from deterioration, even though years intervene between the placing and the discharge of the mines. DISCUSSION. The CHAIRMAN : A very important subject has been brought before us, and one which I have no doubt will elicit a good discussion. I believe there are many gentlemen here who are conversant with the details of the subject, and I will, in the first instance, call upon Professor Abel to give us his views with regard especially to fuses and other...
Page 20 - It will be seen that the two currents do not pass one another, as has been imagined, but that, when both stations signal at the same time, the current sent by either station acts upon the distant instrument, by determining whether the currents sent by that station shall pass through the line or the resistance-coils.
Page 501 - The difference of potential he finds to be about -6 or '7 of that of a Daniell's cell when the metals are perfectly clean ; but by oxidation of the copper it may be made equal to or even greater than that of a Daniell's cell. He has also shown that if zinc and copper cylinders be connected by a wire, the electrometer detects a difference between the potentials of the air in the interior, and, lastly, that if copper filings be allowed to fall from a copper funnel in contact with a vertical zinc cylinder,...
Page 8 - ... be to perceptible electric manifestations, we at present know nothing. You all know that the earth acts as a great magnet: Dr. Gilbert, of Colchester, made that clear nearly 300 years ago ; but how the earth acts as a great magnet, how it is a magnet, whether...