. American X-ray journal . er by the clamps. To showthe position of the hole in the back ofthe sound chamber, a curved piece ofnon-radiable material is held by a springclamp to the edge. This also serves asa reflector for sound waves. Fig. 47shows the arrangement in use. As theroom must be dark the photogtaph wasmade by flash-light. The same plancan be applied to a cryptoscope when wedo not wish to make graphic records, inwhich case the examinations are madein a light room. The size of the screenhere figured is 12 by 14 inches. It is ofthe Kinraide non-phosphorescent typein order to get clear
. American X-ray journal . er by the clamps. To showthe position of the hole in the back ofthe sound chamber, a curved piece ofnon-radiable material is held by a springclamp to the edge. This also serves asa reflector for sound waves. Fig. 47shows the arrangement in use. As theroom must be dark the photogtaph wasmade by flash-light. The same plancan be applied to a cryptoscope when wedo not wish to make graphic records, inwhich case the examinations are madein a light room. The size of the screenhere figured is 12 by 14 inches. It is ofthe Kinraide non-phosphorescent typein order to get clear outlines of thebeating heart. For women a smallerinstrument can be used with advantageon account of the bust development, itbeing important to get the screen asnear the heart as possible so that itsshadow may not be too large. NOTE XLVIII ON SEEING AND HEARING YOUR HEART BEAT. By placing a mirror in proper relationto a luminescent screen, as shown inFig. 48, a man can see his own heartbeat, and by combining the mirror with. Fig. 45.—Roentgen Tube Run Out ofHarmony to Show Discord. forted by being shown through his owneyes that all was well. In usin^ this in- 5g6 THE AMERICAN X-RAY JOURNAL. strument the room should be maoVdark. I have in use another instrumentin which both screen and mirror are en -closed in a case through which is a smallopening for the patients eyes. Withthis the examination can be made ir aroom with a light. It is, however, some-what more clumsy than the one selectedfor illustration. NOTE XLIX— THE GIRDLE. In Thompsons interesting book,Light, Visible and Invisible, on page265, he shows a figure of a Roentgenlight tube which I here reproduce. He Notice also that the illuminated frontarea is not right up to the plane of theanticathode but in front of it. More-over, if we make the target cup-shapedwith its concavity toward the cathodethe dark girdle will extend forward,being wider. This appearance is wellshown in Fig. 50. As we increase thedepth of the conca
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