The Inaccuracy of Movement, with Special Reference to Constant Errors

The Inaccuracy of Movement, with Special Reference to Constant Errors

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...and with unsatisfactory apparatus. The apparatus used in the present research is peculiarly adapted to such procedure, and in the present chapter experiments will be reported in which the method was followed with three observers. The results of Cattell and Fullerton,5 who found the perception and reproduction of extent to be more accurate than that "" Small Differences," pp. 103-116. of time have been quoted as an illustration of the third method. But certain disadvantages in the apparatus used in these observations seem to make further experiments desirable. In the experiments reported by these authors the duration of the movement was not completely under the control of the observer. His task was to reproduce, by a movement of 50 cm., the time of a previous movement of the same extent. It was not a question of stopping a controlled movement at the expiration of a given period, but of reaching a certain fixed point at such a time. If the speed was miscalculated no correction could be made, since, if the distant point were not yet reached at the proper time it was necessary to continue the movement beyond the time felt to be sufficient, while, if the point happened to be passed too soon, the record was already made. Under these conditions it would seem that perception of speed rather than perception of duration was under investigation. Moreover these writers report data for only, and 1 second. With the duration more perfectly under the control of the observer the perception and reproduction of time might conceivably be found to be more accurate than under the conditions just described. With the present apparatus such conditions are easily fulfilled. As the car moves along the track the duration is recorded accurately and graphically...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236583744
  • 9781236583741