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aerial alternating current antimony apparatus armature arrangement base-board battery bell bobbin brass balls brass tube centre charged body circuit coherer commutator conductors connected copper wire core current of electricity decoherer diameter disc discharge distance drilled ebonite edge effect electric waves electrical disturbance electro-magnet experiments extremities filings fitted flow Hertz waves Hertzian waves holes Illustrations induced body induction coil inductive effect inserted insulated iron layer length Leyden jar light local battery magnet Marconi means medium metal molecules momentary current motor negative non-conductor Oliver Lodge ordinary oscillator outer coating paraffin wax pass passage Paternoster Square piece plank plates platinum pole position projecting receiver relay resistance ring round screw sheet shellac shown signals similar solder spark strips sufficient surface surging Syntonic take place tapping-key telephone terminal Tesla's thick tightly tinfoil transmitter tricity vibration rate waves set Wimshurst Machine wire wireless telegraphy zinc
Page ii - Electric Bells, and all about them. A Practical Book for Practical Men.
Page 15 - ... a single spark from the prime conductor of the machine, of about an inch long, thrown on the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of wire placed in the cellar beneath, at a perpendicular distance of thirty feet with two floors and ceilings, each fourteen inches thick, intervening.
Page 138 - HASKINS, CH The Galvanometer and its Uses. A Manual for Electricians and Students.
Page 40 - When working with the radiating sphere, Fig. 19, at a distance of forty yards out of window, I could not for this reason shout to my assistant, to cause him to press the key of the coil and make a spark, but I showed him a duster instead, this being a silent signal which had no disturbing effect on the coherer or tube of filings. I mention...
Page ii - THE ELECTRO-PLATER'S HANDBOOK. A Practical Manual for Amateurs and Young Students in Electro-Metallurgy. With Full Index and 61 Illustrations. Second Edition, Revised and Enlarged, with an Appendix on ELECTROTYPING. 3*. 'An amateur could not wish for a better exposition of the elements of the subject.
Page 31 - Moreover, he proved that these surging waves were capable of setting up similar waves in bodies in their vicinity, provided these bodies were of such electrical capacity as to be able to vibrate electrically, at the same rate as the body which emitted them. This...
Page 138 - I. d. GRIFFITHS, AB Treatise on Manures . . .76 GUTTMANN, O. Manufacture of Explosives. 2 Vols. . 42 0 „ Twenty Years' Progress in the Manufacture of Explosives . . net 3 0 HARRIS, W. Practical Chemistry. Vol. I. Measurement 1 0 Vol.. II. Exercises and Problems . .16 Vol. III. Analysis . . . .16 HATCH, FH Mineralogy, The Characters of Minerals, their Classification and Description . . .26 HAWKINS, CC, and WALLIS, F.
Page 14 - ... the fact that a single spark of about an inch in length from the prime conductor of a machine passing to the end of a circuit of wire placed in an upper room produced an induction sufficiently powerful to...
Page 29 - As in the case of sound, in order that these waves may become evident to our senses, they must be received by something which is capable of taking up the same rate of vibration, or, as we should say in the case of sound, " in tune
Page 36 - ... take up a symmetrical position, the individual particles arranging themselves in lines transversely to the direction of the flow of the current. This effect may be likened to the result produced on a company of soldiers standing " at ease " when the officer gives the command,