. X-rays simply explained : a handbook on Röntgen rays in theory and practice . ometimes ohtained, the tuhe was placi-d laihn hi-h for snhjeet in fear of stere(.seo]>ic exa^rjrt^rati^m. Inrviewiii^ nijrjitives, air suhstituted for en-carriers are in front (»f the ghiss,and tlie hoxes eontain lamj^s of eiiual ,which illuminate the ground-glass and the iKgatives from hehind. Slereoscopic Fluoruscopes.—ExteWGui eftects are ohtainal^le hy the alternate excita-tion of two sources of X-rays at the correct distance ai»art. A se
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . ometimes ohtained, the tuhe was placi-d laihn hi-h for snhjeet in fear of stere(.seo]>ic exa^rjrt^rati^m. Inrviewiii^ nijrjitives, air suhstituted for en-carriers are in front (»f the ghiss,and tlie hoxes eontain lamj^s of eiiual ,which illuminate the ground-glass and the iKgatives from hehind. Slereoscopic Fluoruscopes.—ExteWGui eftects are ohtainal^le hy the alternate excita-tion of two sources of X-rays at the correct distance ai»art. A series of stereoscopic shadows is cast on thescreen, hut these yield only a hlurred and until some selective appliance confines thevision of each eye of the ohserver to the shadows ]no-duced l)y one source only. The necessary selectionis oV»tained through revolving apparatus wliich cutsoff the vision of the eyes alternately by the int^r- PRACTICAL X-KAV WORK 105 Platk VI. 0(1 \ I! \\s ) VI
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