Identifier: manabnormalmanin00macd (find matches)
Title: Man and abnormal man, including a study of children, in connection with bills to establish laboratories under federal and state governments for the study of the criminal, pauper, and defective classes, with bibliographies
Year: 1905 (1900s)
Authors: MacDonald, Arthur, 1856-1936
Subjects: Child development Child development Criminal anthropology Criminal anthropology Defective and delinquent classes Child psychology Child psychology Criminology
Publisher: Washington, Govt. print. off.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 20. See On apparatus for testing the delicacy of muscular and other senses in differ-ent persons, by Francis Galton, F. K. S., Journal of the Anthropological Institute,May, 1883. 176 MAN AND ABNOKMAL MAN. weight from each other. The three weights in each tray form a series of graduallyincreasing weights in geometrical progression and the series in each tray differ invalue. It follows from Webers law that if a person can just appreciate the differencesbetween two consecutive weights in one tray he can then also just appreciate the
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Pig. 21.—Pneumograph. (Verdin.) difference between the other consecutive pair in that tray. The following are thevalues of the weights in each tray, where Jr= 1,000 grains and of r=1.01: Weights contained in tray— No. 2. No. 3 Wro, Wr*, Wr^, Wr*, Wr», Wr, No. 8 Wr^, N o. 9 Wr^, No. 10 - Wr*, No.,12 Wr^, No. 4.No. 5. No. 6. No. 7. Wr\ Wr\ Wr* Each weight has engraved in an inconspicuous manner the index of the power ofr: thus in tray No. 2 the weights have the numbers 0, 2, 4, and in tray No. 3 theyhave 4, 7, 10. Thus the number of each tray is the difference of the powers of r intwo consecutive weights in that tray. Maker, Cambridge Scientific InstrumentCompany, England. MEASUREMENT OF PRESSURE—BARiESTHESIOMETER. The bartesthesiometer (fig. 22), designed by Professor Eulenburg, of Berlin, isconstructed on the principle of a spiral-spring balance. A small knob A is pressedupon the skin gradually. One method is to press until the marker B reaches, say,50 grams, then the subject c

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