Supplementary Educational Monographs Volume 5

Supplementary Educational Monographs Volume 5

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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. 1917 edition. Excerpt: was constructed so that simultaneous photographs could be taken from the two eyes. The lenses used are Goerz-Syntor, 12-inch focus. The mounting was necessarily complicated, in order that the focus might be accommodated to each individual subject. One adjustment was provided so that the two lenses could be separated or brought near together. A second adjustment allowed the left lens to move independently in a vertical direction. A third and fourth adjustment allowed the camera as a whole to be moved horizontally or vertically. A fifth and sixth adjustment permitted the lenses to be focused by independent movements forward or backward or by a movement of the filmholder. All of these adjustments could be made from the back by the operator by means of rods and screws. The body of the camera was made of a brass tube, eight inches in diameter and four feet in length. At the back end of this was placed the usual camera bellows, which allowed adjustments. Since the records were all taken in a light room, a focusing bellows was provided back of the film-holder. Fig. 4 shows the camera. The moving film.--The film used is the twelve-exposure Eastman Kodak film. The length is about 1.2 meters. The mechanism for carrying the film is shown in Fig. 5. The apparatus was so constructed that two films could be set in motion at the same time, one moving vertically, the other moving horizontally, or a single film could be used. In general only the vertically moving film was used. If the vertical film alone is used, it unrolls from the spool C to a spool carried between D and E. The driving power is applied to the rod D by a motor (not shown in the figure). The exposure of the film during its movement is made as it passes the area A, where the more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236523148
  • 9781236523143