. Un testo-libro di radiologia . ake - e per i nostri scopi peggio che inutile. Il modo corretto per aumentare l'uscita di una bobina per scopi X è quello di aumentare l'intensità degli impulsi individuali, e questo può essere ottenuto solo da un relativamente Morton. * 82 TESTO-LIBRO DI RADIOLOGIA. Basso tasso di interruzione. In condizioni favorevoli un singolo flash è sufficiente per radiografare le parti più spesse del corpo, ma non rientra nella terange di una bobina ordinaria. La terza classe, o tipo centrifugo di rotture di mercurio, isof relativamente re-centesimo introduzione e ha molti punti d'eccellenza. L'azione di principio è sh
982 x 2545 px | 8,3 x 21,5 cm | 3,3 x 8,5 inches | 300dpi
Altre informazioni:
Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.
. A text-book of radiology . ake—and for our purposes worse than useless. Theproper way to increase the output of a coil for X-raypurposes is to increase the intensity of the individualimpulses, and this can be obtained only by a relatively Morton. * 82 TEXT-BOOK OF RADIOLOGY. low rate of interruption. Under favourable conditionsone single flash is enough to radiograph the thicker parts of the body, but thisis not within therange of an ordinarycoil. The third class, orcentrifugal type ofmercury breaks, isof comparatively re-cent introductionand has many goodpoints. The principleof action is shown inPig. 34. The driving forceis obtained from asmall electric motorM, so mounted thatits shaft is in thevertical position.Mounted on this shaftand revolving with itis a cast iron con-tainer C, into which isplaced some mercuryand the dielectricfluid, which may bepetroleum or alcohol. When it is made torevolve rapidly, themercury, being theheavier fluid, willtend to form an equa-torial belt, Hg, roundthe inside and moving. Fig. 34. • Principle of Centrifugal Type of Mercury Interrupter. Above is shown a plan of section across the line A B. at a velocity only slightly less than that of the jaritself. MERCURY INTERRUPTERS. 83 A fibre disc, D, with two metal segments, S, is mountedon a vertical shaft and so arranged inside the containerthat its edge can be made to engage the whirling band ofmercury more or less at will. The electrical connectionsare such that contact is made when a metal segment entersthe mercury, and the break occurs as it leaves. Owing tothe centrifugal action there is no tendency for the mer-cury to cling to or follow the disc, and the break is verysudden and complete. I have had one of these interrupters in constant use forfive years, and during that time it required no attentionwhatever except the occasional addition of a smallquantity of fluid and mercury, and cleaning at intervalsof a year or so. Instead of the revolving segmented disc, another makerli
