. Personal identification; methods for the identification of individuals, living or dead. ndon.) fingers on white painted woodwork, and under the circumstances they arevery clear and distinct (Figure 102). At one time one of the authors discovered h faint ridge imprint indried blood on the black handle of a razor, that had escaped observation forfour months after a certain murder. Some thirteen months later an expertphotographer succeeded in obtaining a photograph by using a verticalcamera, with Wratten and Wainwright pan-chromatic plates and a RedA filter. The impression was irregular in shap
. Personal identification; methods for the identification of individuals, living or dead. ndon.) fingers on white painted woodwork, and under the circumstances they arevery clear and distinct (Figure 102). At one time one of the authors discovered h faint ridge imprint indried blood on the black handle of a razor, that had escaped observation forfour months after a certain murder. Some thirteen months later an expertphotographer succeeded in obtaining a photograph by using a verticalcamera, with Wratten and Wainwright pan-chromatic plates and a RedA filter. The impression was irregular in shape, and measured about Accidental Impressions and their Development 277 11mm X 5mm. The photograph was made in dayhght and under thecircumstances was a remarkable success (Figure 103). In obtaining photo-graphs of accidental imprints, the most expert photographer that can befound should be employed, as it will be the cheapest in the end. A wordof caution: all accidental imprints before and after developing shouldbe protected from friction, as many such are spoiled by failing to observe. Figure 94. Enlargedimprintof the right thumb of George Lane. Comparewith the marks on the box, shown in the preceding figure, and check up the 18points of identity. (From Scotland Yard.) this common sense precaution. The surest method to preserve such im-pressions is to spray them with a shellac fixative immediately after de-velopment, exactly as artists treat crayon drawings. The proper fixativefor this purpose, together with a sprayer with which to distribute it, maybe obtained at any art store. The authors have made reversed photographs by taking enlargementsprinted on single thickness of photograph paper, the ridges being shown 278 Personal Identification by white lines, and, using such photographs as negatives, placing thesensitized paper back of the paper negative, the sensitized surface in con-tact with the back of the photograph that is to be reversed. In making /VA/^£J=? Af/%tK ON CLanG
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Keywords: ., bookcentury1900, bookdecade1910, bookidpersonaliden, bookyear1918
