. X-rays simply explained : a handbook on Röntgen rays in theory and practice . kers of par-ticular plates may he relied upon to give good results,and if the exposure has heen correct the periodof development should have a known value whichthe nuvnufacturers should state. With WrattensX-ray ])lates the author has detained excellentresults hy 5 or 6 minutes development in Parakone,an excellent product sold hy Messrs Hinton & Co. ofBedford Street, London, Using the two-solutiou developer as sold for(ordinary photograi)hic work, one part of each solutionin a total of four parts is the propor
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . kers of par-ticular plates may he relied upon to give good results,and if the exposure has heen correct the periodof development should have a known value whichthe nuvnufacturers should state. With WrattensX-ray ])lates the author has detained excellentresults hy 5 or 6 minutes development in Parakone,an excellent product sold hy Messrs Hinton & Co. ofBedford Street, London, Using the two-solutiou developer as sold for(ordinary photograi)hic work, one part of each solutionin a total of four parts is the proportion recommendedfor radiographs of large opaque parts of the body, andabout one part of each in a total of ten for the hand,shells, and similar small objects. If necessary the temperature of the developershould be raised to 60^ or 65^ C. by standing themeasuring glass in warm water and stirring. After dusting the plate with a soft camels-hairbrush, develop as in ordinary pliotography. Avaluable aeid-fixinfr batli is made up by dissolving PRACTICAL X-IIAY WORK 95Plate Radiogiiapii of a Hand. Exposure 20 seconds in accurdauce withtlie results of the trials shoAvn in Plate III., where the centrestrip shows the best combination of contrast and detail. Allconditions the same as for Plate III. Of) X-HAVS ) (j <•/. nf •• hypo ;iinl I n/. iti iiiclaltisuljiliilr (»f jintasliin 1 |»int nf watn /^i;jf// Exposure.—Ilie strij) of the j)lato wliiclisliows the hust (letiiil and contraHt indicates the correctcxposnre, and an actual radiograph shouhl he HiicceHS-tul if the cxposun^ the dcvcloiur, the tenipci-ature,and the condition of the tuV)e remain nnclianj^ed. To secure the latter the tube should he workedfor a short time before making either of the twoex})osures. In choosing between the 8trij)S it must be borne inmind that a longer ex]) is retjuired for the wristand ]ialm than for the linger-tips, and that a com-])romise must be made between the
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