Indiana university, 1820-1904; historical sketch, development of the course of instruction, bibliography . SCOPEDesigned by Professor J. A. Bergstrom, and described in the Psychologicxl Eeview for September, lOOO. New features consist in the mode of carrying and clamping the index, the silent escapement,and a system of movable keys which provide for intervals varying from about tosi! of a secondto 2 or more seconds. The apparatus is of special service in giving the time of exposure in thetachistoscope, in experiments upon the perception of time or the direction of attention to simul-taneous ev
Indiana university, 1820-1904; historical sketch, development of the course of instruction, bibliography . SCOPEDesigned by Professor J. A. Bergstrom, and described in the Psychologicxl Eeview for September, lOOO. New features consist in the mode of carrying and clamping the index, the silent escapement,and a system of movable keys which provide for intervals varying from about tosi! of a secondto 2 or more seconds. The apparatus is of special service in giving the time of exposure in thetachistoscope, in experiments upon the perception of time or the direction of attention to simul-taneous events, and as a chronoscope for measuring short intervals of time with a very highdegree of accuracy. 94 Departments of Liberal Arts the student with the leading facts of past educational theory and practiceor with modern school organization, purpose and method, but more espe-cially to the end of developing a sense for educational values and of makingpossible the balance of judgment and the ingenuity and fertility in expedi-ents that alone come from a study of well organized series of TACHISTOSCOPEDesigned by Professor J. A. Bergstrom. For exposing to view colors, pictures, numbers, letters, phrases, sentences, and the like, fora very short and (as far as may be) for a definitely adjustable interval, with a view to ascertain-ing the degree of completeness of perception and recognition or the extent of the mental spanunder such conditions. The principle of construction is that of producing a cone of light which at the apex passesthrough a small hole in the inclosing metal cone; on emerging it enlarges, and, after reflectionfrom a mirror, illuminates a considerable surface on which are placed the objects to be features are the relative simplicity of structure, the use of direct illumination insteadof projection, the mode of securing adaptation of the eye, and the small noiseless electric shutterwhich makes its use in connection with the chrono
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Keywords: ., bookauthorindianau, bookcentury1900, bookdecade1900, bookyear1904
