Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fis?, 292. -Radiograph of the Human Foot in a by Roentgen rays. dicated exposure to light when developed. Upon furtherinvestigation he found that a light was emitted from thevacuum tube, not perceptible to the human eye, butcapable of penetrating many substances, as wood, metal,paper, etc. When different substances are interposed betweena protected sensitized plate and an excited vacuum tube, THE INDUCTION COIL. 325 capable of producing rays of this light, it penetrates the
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fis?, 292. -Radiograph of the Human Foot in a by Roentgen rays. dicated exposure to light when developed. Upon furtherinvestigation he found that a light was emitted from thevacuum tube, not perceptible to the human eye, butcapable of penetrating many substances, as wood, metal,paper, etc. When different substances are interposed betweena protected sensitized plate and an excited vacuum tube, THE INDUCTION COIL. 325 capable of producing rays of this light, it penetrates themwith different intensities, according to their density, so thatthe sensitized plate, upon development, shows the shadows of the objects inter-made from such aWhen the humanprotected plate andaffected directly un-they are nearly. posed. A photographic printnegative is termed a is placed between thethe tube the plate is scarcelyderneath the bones, becauseopaque. Considerable light Fig. 293—Focus Tube for X-Ray Work. penetrates the flesh and affects portions of the plate directlyunderneath it. A print made from such a negative givesshadows of the bones and a faint outline of the flesh. Theshadows of the bones in all animal bodies can thus be made,and broken bones andforeign objects, suchas bullets, needles, etc.,accurately located. A radiograph of thehuman foot in a shoeis illustrated in The nails of theshoe, etc., as well asthe bones of the foot,are clearly Roentgenfirst called the rays ofthis peculiar light X-Rays, but they areusually named in hishonor, Roentgen common form oftube used in X-ray work, called a focus tube, is illustratedin Fig. 293. A concave aluminum reflector extends a shortdistance inside the glass tube and a wire attached theretotermina
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