Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 768
the other edge of the slot. Measuring the speed of the drumwhen properly adjusted gave a means of ascertaining the rate ofreading at different intensities of illumination. Reading aloudrequired continuous mental and physical activity on the part of theobserver, who need not be in any degree… … .■\pparatus for speed of discrimination tests. inches deep and 18 inches wide as shown in side view. A drum,C, 6^ inches in diameter, was driven through a suitable reductiongear by means of a small motor. The speed of the motor wasvaried by a sliding rheostat conveniently placed on the front ofthe…
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Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
