Proceedings of the Annual Meeting - Association of Railway Telegraph Superintendents

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Association of Railway Telegraph Superintendents., 1897
Constitution, by-laws and list of members included.
 

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Page 49 - From a series of experiments with this and other magnets it was proved that, in order to produce the greatest amount of magnetism from a battery of a single cup, a number of helices is required ; but when a compound battery is used, then one long wire must be •employed, making many turns around the iron, the length of wire and consequently the number of turns being commensurate with the projectile power of the battery. In describing the results of my experiments the terms intensity and quantity...
Page 6 - Monthly meetings shall be held at such time and place as shall be designated by the executive committee.
Page 48 - In the arrangement of Arago and Sturgeon the several turns of wire were not precisely at right angles to the axis of the rod, as they should be, to produce the effect required by the theory, but slightly oblique, and therefore each tended to develop a separate magnetism not coincident with the axis of the bar. But in winding the wire over itself, the obliquity of the several turns compensated each other, and the resultant action was at right angles to the bar. The arrangement then introduced by myself...
Page 48 - And in another later paper, he repeated to the same effect: -"After reading an account of the galvanometer of Schweigger, the idea occurred to me that a much nearer approximation to the theory of Ampere could be attained by insulating the conducting-wire itself, instead of the rod to be magnetized; and by covering the whole surface of the iron with a series of coils in close contact.
Page 48 - After reading an account of the galvanometer of Schweigger, the idea occurred to me that a much nearer approximation to the requirements of the theory of Ampere could be attained by insulating the conducting wire itself, instead of the rod to be magnetized, and by covering the whole surface of the iron with a series of coils in close contact.
Page 49 - This was due to the increased resistance which the longer wire offered to the conduction of electricity. Two methods of improvement therefore suggested themselves. The first consisted, not in increasing the length of the coil, but in using a number of separate coils on the same piece of iron. By this arrangement the resistance to the conduction of the electricity was diminished and a greater quantity made to circulate around the iron from the same battery. The second method of producing a similar...
Page 48 - KS- 5. was extended by employing a still longer insulated wire, and winding several strata of this over the first, care being taken to insure the insulation between each stratum by a covering of silk ribbon. By this arrangement the rod was surrounded by a compound helix formed of a long wire of many coils, instead of a single helix of a few coils...
Page 51 - Count the number which pass through the area enclosed by the circuit of the conductor, then any motion which increases this number will be aided by the electro-magnetic forces ; so that the work done during the motion will be the product of the strength of the current and the number of additional lines of force. For instance, let the lines of force be due to a single magnetic pole of strength m. These are 47rtti in number, and are in this case straight lines radiating equally in all directions from...
Page 4 - The delegates shall be elected by ballot and shall hold office for one year, or until their successors have been elected and qualified. Enacted 1935.
Page 57 - ... force to remain constant. Hence it is evident that a certain proportion between the resistance of the wire and that of the remaining portions of the circuit must be preserved to obtain the maximum magnetic force. This relation...

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