. Manual of mental and physical tests : in two parts : a book of directions compiled with special reference to the experimental study of children in the laboratory or classroom. results. To obviate theseerrors and to render the test more simple in execution and morereliable in outcome, the use of a pressure-balance, following TEST 21: DISCRIMINATION OF lIii:SSURE 231 (he pviiiciple aclopled by Merkcl (7, p. 255) is desiiablc, iC not essential. Other forms of pressure-balance have beeu elaborated by Jaslrow (5) —figured by Sanford (S, pp. 417-8) and by Titchener (10, pt. ii.)—and byBolton and W
. Manual of mental and physical tests : in two parts : a book of directions compiled with special reference to the experimental study of children in the laboratory or classroom. results. To obviate theseerrors and to render the test more simple in execution and morereliable in outcome, the use of a pressure-balance, following TEST 21: DISCRIMINATION OF lIii:SSURE 231 (he pviiiciple aclopled by Merkcl (7, p. 255) is desiiablc, iC not essential. Other forms of pressure-balance have beeu elaborated by Jaslrow (5) —figured by Sanford (S, pp. 417-8) and by Titchener (10, pt. ii.)—and byBolton and Witbey (1). The balance here prescribed has been designedby the author (11) to supply in a single relatively simple apparatus udevice for determining both the capacity for pressure discrimination andsensitivity to pain (Test 22). It may be regarded as a combination of theprinciple of Merlcels and of Jastrows pressure-balances and that of Gil-berts balance-algometer (3). Apparatus.—Tlie authors pressure-pain balance (Fig. 51).Cardboard screen with suitable supports. Seconds peiiduUun(Fig. 28), or other noiseless device for controlling the time-relations of the FIG. .54. PRESSURE-PAIN BALANCE. Preliminaries.—Place the balance upon a low table. Seethat the beam of the instrument moves freely, but conies torest in a horizontal position when no weights are applied: ifnecessary, turn the small screw in the tip of the arm inwardor outward until this position of rest is secured. To assure comfort, the instrument should be so placed that/Ss wrist will come just over the edge of the table; his elbowwill not then be forced up into an awkward position, and hishand can lie upon the hand-rest, with the end of his forefingerprojecting straight forward between the upper (stationary)and the lower (movable) tip of the balance. Adjust the uppertip so that it is in permanent contact with the center of thefinger-nail, but does not touch the skin of the finger. 232 SENSORY CAPACITY Ana
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Keywords: ., boo, bookcentury1900, bookdecade1920, booksubjectpsychophysiology
