. X-rays simply explained : a handbook on the theory and practice of radiography . ll the exp Tin plate is now ready for development, but beforel ling to this b1 ige, .1 few words may be about comparat ive exposure. It Bhould be always borne in mind that as thepractically emanate from a point on the their intensity is proportional to the squareof the distance from that point. For example, if,with the anti-kathode al 6 in. from a hand, anexposure of 2 minutes is required, the exposuretry, when the distance Lb increased to 12 in.,is not 4 minutes (2x2) but is 2x2* that is 8minutes
. X-rays simply explained : a handbook on the theory and practice of radiography . ll the exp Tin plate is now ready for development, but beforel ling to this b1 ige, .1 few words may be about comparat ive exposure. It Bhould be always borne in mind that as thepractically emanate from a point on the their intensity is proportional to the squareof the distance from that point. For example, if,with the anti-kathode al 6 in. from a hand, anexposure of 2 minutes is required, the exposuretry, when the distance Lb increased to 12 in.,is not 4 minutes (2x2) but is 2x2* that is 8minutes. Mr Lewis Wright gives the followingfigures for the exposure required for different UrTIO\ O!- \-HAYS. 87 Radiograph of a Hand. Exposure 20 seconds in accordance withthe results f the trials shown in Elate II., where the centrestrip shows the best combination of contrast and detail Allconditions the same as for Plate II. \-i:\vs simply EXPLAINED. For the tool or ankle \ three times what Lb required for a hand, and for tin* trunk ten times. Other comparative results Bhow thai the arm ox leg below the knee require about four times the hand- The upper part of the even more than the thorax, and the abdomen, the most difficult part, may even require 30 minutes with an apparatus which would give a -jxxl hand result in1 minute or 1Dry Plates and their Development. Ajiv good make i>\ rapid plates may lie chosen, hut the author in-variably uses Edwards cathodal plates which aremade especially for X-ray work, and an; only;id t<» the Lumiere brand for this particularpurpose. As the latter make is very expensive,theformer, which produces excellent results, is recom-mended and the metho
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcathode, bookyear1903
