Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . y competent investigators, e. g., Ament, Aubert, Bouguer,Helmholtz, Frobes, Kraepelin, Masson, Merkel, Schirmer,Volkmann, and others. Tests of school children by Gilbert(3) and Spearman (6) have followed simpler methods. In the laboratory, use has been made of Massons disc, bothby daylight and artificial illumination, of the episkotister, ofgray papers and of shadows. Toulouse (9) proposes solutionsof aniline colors in glass re
Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . y competent investigators, e. g., Ament, Aubert, Bouguer,Helmholtz, Frobes, Kraepelin, Masson, Merkel, Schirmer,Volkmann, and others. Tests of school children by Gilbert(3) and Spearman (6) have followed simpler methods. In the laboratory, use has been made of Massons disc, bothby daylight and artificial illumination, of the episkotister, ofgray papers and of shadows. Toulouse (9) proposes solutionsof aniline colors in glass receptacles. Gilbert used a seriesof ten pieces of cloth soaked in a red dye of graded that are most comparable with the method hereproposed are those of Ament (1), Frobes (2), and Spearman, 194 SEXSORY CAPACITY all of whom made use of gray papers, and of Gilbert, who ex-amined school children, though with chromatic stimuli. A. DISCRIMINATION OF GRAYS—REFLECTED LIGHT ArPARATUs.—Set of 10 test-cards, each composed of twogray strips, 13x40 mm., on a white background, 10x10 frame, fitted with a card-holder which may be rotated. FIG. 46. APPARATUS FOE THE DISCRIMINATION OF GRAYS. through 180°, and with a black screen, through an opening(8x8 cm.) in which the test-cards may be viewed (Fig. 46).Light gray cloth, about 70 x 160 cm., for a background. Twosupports, with angle-pieces, and a horizontal rod 70 cm. The cards are numbered from 0 to 9, corresponding to 10 different pairsof stimuli. Each card contains one strip of the lightest or standard gray,and one strip of comparison gray. Card No. 0 represents no difference,or objective equality; Card No. 1 represents the minimal objective differ-ence ; Card No. 9 the maximal objective difference and is easily supra-liminal for the normal eye. Each card is numbered on the back in sucha way that, when looking at the face of the card with the number up,the right strip is the darker; the
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectpsychophysiology
