We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
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THREE-DIMENSIONAL MOTION PICTURES having to alter Its position. We refer to this as focusing the eyes. That the eyes have to be focused for objects at different distances Is very evident, and can easily be proved. Take two pencils and hold them in line, one be hind the other. Hold one about nine inches in front of the eyes and the other about a foot further away, directly behind the first pencil. By no means can both pencils be brought into focus at the same time, if the first one is in focus the second pencil is blurred. If the eyes are focused on the second pencil, then the first one is blurred and indistinct. The focusing of the eye has doubtless something to do with the perception of distance; for a certain state of the ciliary muscle and lens must always be associated with the Idea of distance, while another state will never fail to be an index of nearness. Many other facts co-operate with these to give up a more or less perfect perception of distance, a very Important one being the size of the image on the retina; the greater the distance becomes of an object from the observer, the less the Image projected onto the retina. If the object remain the same, the greater the area of retina which is affects, the nearer we judge It to be to us; and conversely, the less the area of retinal nerve- matter It covers, the farther off we think it is. Another important element In the perception of distance Is the use of the outside eye muscles; for In looking at near objects we contract the Internal recti muscles, and this action we come to associate with an idea of short distance, and the less amount of action the farther off we think things are, so that when the eyes are directed to a far-off object the very fact of our not having to use the recti muscles much in converging