. The principles and practice of roentgenological technique . emd ell-evatiomSimqle: wiisdow feame OUTFIT. Fig. 293. EIND ELEVATIOM OOU&LE WIHDOW FieAMEOUTFIT. Fig. 294 [213] 214 EXAMINATION BY REFLECTED LIGHT placed behind a window of ground glass. Thelight is first generally diffused by the use oftracing cloth or paper. It should be consid-ered an essential in such construction that theplate to be viewed rest not against the groundglass but at a distance of two inches from it,preferably against a sheet of clear of ground glass, the so-called blazed glass may be used as a diffus
. The principles and practice of roentgenological technique . emd ell-evatiomSimqle: wiisdow feame OUTFIT. Fig. 293. EIND ELEVATIOM OOU&LE WIHDOW FieAMEOUTFIT. Fig. 294 [213] 214 EXAMINATION BY REFLECTED LIGHT placed behind a window of ground glass. Thelight is first generally diffused by the use oftracing cloth or paper. It should be consid-ered an essential in such construction that theplate to be viewed rest not against the groundglass but at a distance of two inches from it,preferably against a sheet of clear of ground glass, the so-called blazed glass may be used as a diffusingmedia. This needs no paper diffusion and isvery serviceable. Instead of tungsten lamps,blue glass nitrogen lamps are of late utilizedand give powerful illumination but generateconsiderable heat. The box should be paintedwhite within and the lights be so disposed asto aid diffusion. The front of the box shouldbe provided with a double black curtain ar-rangement for the accommodation of plates ofall sizes. Means for dimming the illuminationshould also be provided. These boxes maybe constructed with an illu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
