A manual of the study of documents to establish the individual character of handwriting and to detect fraud and forgery, including several new methods of research (1894)
Frazer, Persifor, 1844-1909 · Philadelphia : J.B. Lippincott company · leaf 73
nearly vertical illumi- 56 STUDY OF HANDWRITING nation, or almost the same effect as is seen in the microscope whendiffused daylight is used as the illuminant. You notice that bothphotographs show the dark ink on top. (See A and B.) In order to get pictures of the slides in an inclined position,… … As a good microscope lens has almost no depth of focus, it was im-possible to get immediately an enlarged picture of the cross, as onlyone plane would be in focus at one time. Mr. Zentmayer kindlylent me a lens made on the principle of the portrait-lens of two inchequivalent focus, and I stopped it…
Writing -- Identification · Forgery · Graphology
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