. Gli usi medici e chirurgici dell'elettricità : compresi i raggi X, la luce Finsen, le terapie vibratorie e le correnti ad alta frequenza . passati, e si estendono al rivestimento interno. Ora, quando l'elettricità positiva o negativa viene comunicata alla manopola in alto, essa viene diffusa in modo mimo su tutto il rivestimento interno; e per la sua infiammazione induttiva il rivestimento esterno assume il tipo opposto. IL LEYDEN JAR. 17 quando in questo stato, i due rivestimenti essendo elettrificati in modo opposto, si dice che il vasetto sia carico e che si abbia uno scarico quando si stabilisce una comunicazione tra il

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. The medical and surgical uses of electricity : including the X-ray, Finsen light, vibratory therapeutics, and high-frequency currents . passed, and extends to the inside coating. Now, when either positiveor negative electricity is communicated to the knob at the top, it is mime-diately diffused over the whole inside coating; and by its inductive influ-ence the outside coating takes on the opposite kind. THE LEYDEN JAR. 17 When in this state—the two coatings being oppositely electrified—thejar is said to be charged; and a discharge takes place when a communica-tion is established between the knob and the outside coating, the equilib-rium being restored with a bright flash of light and a sharp report. As the human system is a good conductor, this discharge may takeplace through it by grasping the outside coating with one hand andtouching the knob at the top with the other; or several persons may forma line by grasping hands, the one atone extreme touching the outside coat-ing, while the one at the other extreme touches the knob. All will feelthe shock, as it is called, at the same instant. While the jar is receiving. Fig. 14. the charge, it must not be insulated—that is, the outside must communi-cate with the earth. As the positive charge collects on the inside, theoutside becomes negative by the expulsion of the positive charge, and theaccumulation of the negative charge in its stead, drawn from the earth.But if the outside is insulated, these transfers to and from it cannot takeplace, and therefore the jar cannot become charged. A submarine cable is really a vast Leyden jar. The wire constitutesthe interior coating, the water the exterior coating, and the gutta-perchathe insulator between them. On this account the passage of an electriccurrent through a submarine cable is greatly retarded. If it is desired to accumulate a very great charge of electricity, a num-ber of jars must be employed, all their inner coatings being connected to-gether, and all their ou

Parole chiave associate all'immagine

• bookauthorrockwell
• bookcentury1900
• bookdecade1900
• bookyear1903