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 . s 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-spr
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 . s 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 closes his eyes and the experimenter gradually increaseathe pressure. The subject is to indicate as soon as he feels the additional pressure, MAN AND ABNORMAL MAN. 177 thiis giving his least sensibility to the increase of pressure. The amount is recordedby the hand B. Maker, Hirschmann, Berlin. baro-j:lectro-^sthesiometer. The baro-electro-sesthesiometer, as its name indicates, measures, the amount ofpressure at the time electrical sensilility to tingling or pain is Fia. 22.—Baraesthesiometer. (Eulenburg.) The instrument (fig. 23) is Euleuburgs baraesthesiometer, with such additions bythe author as to make it serve for an electrode. Two round steel knobs can bescrewed on to the end of rod A; one is 20 millimeters, the other 35 millimeters indiameter. At B is fastened a short rod, with a hole and screw, by which a wire canbe held, which connects with the battery. An indifferent electrode is fastened, say,to the hack of the head. We will suppose it is desired to find the strength of cur-
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