. An elementary manual of radiotelegraphy and radiotelephony for students and operators . d an increasing strain to acurrent in the same direction as the strain. Also that the relationbetween the direction of a current and of the direction of itscircular embracing magnetic flux is that of the thrust and twist ofa corkscrew. Again, by Maxwells second principle, the creation of a line ofmagnetic flux, or its strengthening, involves the production ofelectric strain along lines embracing the flux line, so related as todirection that on any section plane transverse to the flux line the 134 RADIOTEL
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . d an increasing strain to acurrent in the same direction as the strain. Also that the relationbetween the direction of a current and of the direction of itscircular embracing magnetic flux is that of the thrust and twist ofa corkscrew. Again, by Maxwells second principle, the creation of a line ofmagnetic flux, or its strengthening, involves the production ofelectric strain along lines embracing the flux line, so related as todirection that on any section plane transverse to the flux line the 134 RADIOTELEGRAPHY electric strain is counter-clockwise in direction round that part ofthe section in which the flux is away from the reader, and clock-wise around that section of the flux which is towards the reader,l^earing tliis in mind, it will be seen that the diminution of theoriginal central electric strain is accompanied by the production ofa series of concentric circular lines of magnetic flux all embracingthe original line of strain, and witli directions as denoted in Tig. 5. ELECTRIC^. ^STRAIN These flux lines are not, however, created simultaneously. Theflux lines nearest the original strain are generated and increase asthe original strain dies away, and this creation of magnetic fluxinvolves the production of other closed loops of electric strainlinked with these flux lines, which new strain lines tend, as theyare produced, to create in turn other circular lines of magneticflux in the same direction as the first created, but lying furtheraway from the line of original strain. In this manner a state ofalternate electric strain and magnetic flux is created at continuallyincreasing distances, and is propagated out into the medium. Atthe instant when the original central electric strain has disappearedthe line of flux nearest to it, due to its variation, has disappearedalso, but the disappearance of this flux involves the creation oflines of electric strain linked with it, which
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
