Psychological Monographs Volume 8

Psychological Monographs Volume 8

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...line, AB, Fig. 79, upon the secondary line, A' B', is found as before. Then the horizontal distance from the primary line to the marker, AX, is measured, and the same distance taken from the traced line, A76'. This brings the record of speed under that part of the time line which was made at the same time as the part of the line to be measured. Similar correction is made at B' by deducting a distance on the time line equal to BY. The time is now measured on the time line between points vertically above X' and Y'. This figure shows the principle of correction when it becomes necessary to measure the time of any horizontal or oblique movement. Evidently in all such cases the distance between the two points on the secondary record on the moving strip represents not merely the distance through which the strip travels while the line is being drawn, but also the negative or positive change in horizontal position of the pencil point as it makes the line. The change in position of the pencil point must, therefore, be allowed for either negatively or positively in order to get the simple time determination. In order to make the necessary correction in reading the record, if the pencil moved in the same direction as the strip, this primary pencil movement must be added to the distance between the two corresponding points on the strip; if the pencil moved in the opposite direction, the distance must be subtracted. In the case of an oblique line the horizontal distance through which the pencil traveled must be allowed for, as in the case of the horizontal line. In projecting A and B in Fig. 79 to A' and B', the distances A'X' and B'Y' were recognized as unequal. The greater...show more

Product details

  • Paperback | 144 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236746481
  • 9781236746481