. Practical radiography : a handbook for physicians, surgeons, and other users of X-rays . 750 Fie. 32. Diagram 34 shows for the same sample of iron as above thecorresponding magnetic curve, and it is obvious thatfor the same period of contact as above (1J0 0) we obtain a much higher magnetization. The first of the above methods, reducing the. 500 ^TlME Fie. 33. frequency and prolonging the contact (by raising thelevel of the mercury against the dipper), has often to beresorted to when working large coils from a few cells, andit is one of the advantages of mercury breaks that this canbe e
. Practical radiography : a handbook for physicians, surgeons, and other users of X-rays . 750 Fie. 32. Diagram 34 shows for the same sample of iron as above thecorresponding magnetic curve, and it is obvious thatfor the same period of contact as above (1J0 0) we obtain a much higher magnetization. The first of the above methods, reducing the. 500 ^TlME Fie. 33. frequency and prolonging the contact (by raising thelevel of the mercury against the dipper), has often to beresorted to when working large coils from a few cells, andit is one of the advantages of mercury breaks that this canbe effected within wider limits and much more reliably than Induction Coils and Interrupters 73 is the case with vibrating platinum breaks, where the pro-longing of the contact periods can only be effected (in mostin stances) by applying undue tension to the spring, thuscausing the platinum studs to stick or weld togetherwhen heavy currents are passed; the springs also get hotand change their elasticity and vibration period. In bothcases also the slowness of the interruptions seriously inter-fered with the steadiness of the shadow on the screen. Onthe other hand, owing to excessive sparking between thecontacts and to the formation of arcs between the dipperand the mercuiy surface, the application of higher pressures
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectxrays, bookyear1901
