. The American journal of roentgenology, radium therapy and nuclear medicine . adiographed in its case. tions when radiographing considerablethicknesses will be obviated. Figures 9, 10and 11 are radio-metallographs taken in thefraction of a second on the Impex plate, theratio of reduction of exposure being about30-1. Figure 9 is an alarm clock radio-graphed in its case. Figure 10 is an electricswitch. Figure 11 is a direct vision spectro-scope. The flint crown glass prisms areclearly differentiated. The great reduction of exposures affordedby the use of the Impex plate is advanta-geous in many
. The American journal of roentgenology, radium therapy and nuclear medicine . adiographed in its case. tions when radiographing considerablethicknesses will be obviated. Figures 9, 10and 11 are radio-metallographs taken in thefraction of a second on the Impex plate, theratio of reduction of exposure being about30-1. Figure 9 is an alarm clock radio-graphed in its case. Figure 10 is an electricswitch. Figure 11 is a direct vision spectro-scope. The flint crown glass prisms areclearly differentiated. The great reduction of exposures affordedby the use of the Impex plate is advanta-geous in many other respects. The possibilityof taking the number of radiographs withoutthe risk of burns and without the productionof other undesirable results is of course per-fectly apparent. A by no means negligible advantage is thatof the reduction of wear and tear upon ap-paratus, especially upon tubes. The numberof exposures per tube is greatly increased,and whereas during the course of a compar-ativelv long exposure a gas-filled tube willoften vary its vacuum and so give rise to. Fig. 10. Electric switch. of radiography and suffers at present fromthe drawback of reciuiring very extendedexposures in order to penetrate masses ofmetal. The reduction of, say, 20-1 on a 20minutes exposure, means far more actuallythan the same ratio of reduction on an or-dinary exposure of, say, 20 seconds or lessrequired for the radiography of the prejudicial effects of secondary radia- FiG. II. Direct-vision spectroscope with flint crownglass prisms clearly differentiated. variable results, this trouble should not beexperienced with the very short exposuresnecessitated with the new plates. The capacity of low power installations isconsiderably increased. Results can now beobtained with a 12 inch and even with a 10inch low capacity coil ot which were for-merlv possible only with far more expensiveand powerful outfits. Radiographic Exposures Reduced l)y Impex Plate 535 The results so far obtained
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