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By Arthur C. Christie

Excerpt from A guide of X-Ray Technic

Every X-ray Operator is suggested to make himself completely conversant in the main points of building of the actual equipment with which he's operating. he's then in place to maintain it continually at its aspect of utmost potency. along with his gear in good shape he can then progressively grasp the small de tails so necessary to stable X-ray paintings, and with perform in analyzing radiograms he'll ultimately gather skill to correctly interpret them and as a way to arrive at right diagnoses.

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Example text

The necessity for using some form of interrupter, and also a rectifier in the case of alternating currents, both contain- ing some liquid, are disadvantages always encountered with coil Even with apparatus. the use of these appliances inverse currents often persist and cause rapid deterioration of tubes, besides making cult or impossible to obtain good reasons and because of added of apparatus known its it diffi- For these efficiency, the type pictures. as a transformer is at present the most satisfactory for exciting the Rontgen-ray tube.

RT/I{HIM WIRE^ TO / Wi':em«*» ' it*" lu I I Fig. 14. times as much — The Wehnelt electrolytic interrupter. water. The num, and the large one of small electrode lead. is of plati- The platinum rod enclosed in a porcelain sheath and by is means of a EXCITING THE RONTGEN-RAY TUBE 35 screw a smaller or larger amount of the platinum maybe made to project into the liquid. amount projects When a small and rapid, the impulses are small and when a larger amount projects they are heavier and less rapid. The Caldwell- Simon Interrupter.

Electric currents are controlled sistance, by means of re- the current strength being equal to the A MANUAL OF X-RAY TECHNIC 48 by the electro-motive force divided Electrical resistance depends law). terial of of which the conductor length, its cross-section, its Copper wire is is (Ohm's resistance upon the made, the diameter and its temperature. one of the best practical conductors German of electricity, iron wire not so good, and silver one of the poorest. as a conductor but medium. The is The latter is not used at resistance of a conductor to the area of cross-section or square of rheostat usually of a its diameter.

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