. An elementary manual of radiotelegraphy and radiotelephony for students and operators . e is an importantelement in the coil construction. Lord Rayleigh found that ifthe primary circuit is interrupted with extreme suddenness, forinstance, if severed by a bullet from a gun, the secondary sparkk-ngth is not increased by the addition of the condeuser. With theordinary break speed the primary condenser acts to annul murequickly the magnetisation of the coil at each break of the primarycircuit, and it appears to do this by destroying the electric arcwhich tends to form across the contact studs as
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . e is an importantelement in the coil construction. Lord Rayleigh found that ifthe primary circuit is interrupted with extreme suddenness, forinstance, if severed by a bullet from a gun, the secondary sparkk-ngth is not increased by the addition of the condeuser. With theordinary break speed the primary condenser acts to annul murequickly the magnetisation of the coil at each break of the primarycircuit, and it appears to do this by destroying the electric arcwhich tends to form across the contact studs as they separate. A second type of circuit breaker is represented by the mercuryjet interrupter (see Fig. 10). It consists of a cylindrical block ofsteel which is carried on a shaft and has its lower end immersed 50 RADIOTELEGRAPHY in mercury. The block has a vertical bole drilled part of the waythrough it and a lateral hole meets the vertical one. If the blockis made to revolve rapidly, the mercury is sucked up the verticalhole and thrown out of the lateral one in the form of a jet. If. Fig 10. this jet impinges on a copper plate or plates placed in the rightposition, then when the jet is playing on the plate there is anelectric circuit through the jet from the mass of mercury beneaththe centrifugal pump to the target-plate, but w^hen the jet squirtsaside of this plate the circuit is interrupted. To prevent this jet of mercury from being rapidly oxidised, thewhole process must take place in some non-oxidising medium, suchas oil, alcohol, or, better still, coal gas. In one practical form the mercury jet interrupter consists of aglass vessel in the bottom part of which is the reservoir of cover of this vessel carries the steel shaft on the lower endof which is the pierced steel block constituting the centrifugalpump. This sjiaft is rapidly rotated by a small electric lid also carries an insulated terminal to wliich is attachedthe copper plate which forms the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
