. Radiography and the 'X' rays in practice and theory : with constructional manipulatory details . 1 cSn Fio. 12.—Arps Coxtact-Breaker. at Fig. 13 is illustrated the * Vril * contact breaker. Itwill be seen that there are two springs, one carrying It may be well to mention that, owing to the design and carefulconstruction of the Apps contact breakers, they will work within the wholerange of the applications to which the coil can be put. For instance, witha 10 in. spark Apps patented coil, the length of the spark can be regulated,%\ithout altering the battery or source of current, from \ in. to
. Radiography and the 'X' rays in practice and theory : with constructional manipulatory details . 1 cSn Fio. 12.—Arps Coxtact-Breaker. at Fig. 13 is illustrated the * Vril * contact breaker. Itwill be seen that there are two springs, one carrying It may be well to mention that, owing to the design and carefulconstruction of the Apps contact breakers, they will work within the wholerange of the applications to which the coil can be put. For instance, witha 10 in. spark Apps patented coil, the length of the spark can be regulated,%\ithout altering the battery or source of current, from \ in. to nearly12 in. in less than one second. The quickness of the break is exactlyadjusted to the best point. Very erroneous ideas were prevalent as tothe nature of the break of current; and, to verify the practical limits of THE INDUCTION COIL 47 tlio iron head, with a double-cranked extension, c, andthe other bearing the platinum Htud. Ihis latter in theone through which the current passes from the plati-. FiG. 13.— Vkil Contact-Bkkakeu. num-tipped screw, at f, and it is not until the clapperhead has travelled through a certain distance, which utility, about twenty-five years ago Mr. Apps designed and constructedfor the late Mr. H C. Baines, of Pembroke College, a wheel brake, withwedge and lever action, capable of breaking the primary circuit in anytime from 1 second up to J,-, part of a second. The experiments wereof an exhaustive character, and finally determined the degree of sudden-ness, which has been adopted in the contact breaker now made byMr. Apps. 48 UADIOCinAPHY can 1)1 iDUtrollcd to a nifcty \)\ tlu; hciuw i>, that cuntactis hiokiii, by the piece c catching the top end of the con-tact spring, anil piiUing it away from f. Ilonce the coilcore has plenty of time to get magnetised, and yet thebreak, when it does occur, is a clean and sharp modification with double spring, which has givengood results in the authors hands, is shown at tig. consists, virt
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