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.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
CONCLUSION 207
have said the same, but we very much doubt whether the answer is correct. The whole of cinematography is based upon the law of persistence of vision, which states that a view of an object is retained upon the retina of the eye for a fraction of a second after the object itself has been removed. However, it appears that the actual time of persistence depends on other factors, such as brightness, and the time during which the eye was gazing at the object.'
In an ordinary cinematograph projector the ratio between the time of projecting the picture on the screen and changing from that picture to the next along the film is constant. In this new system, however, the projector is designed upon an entirely different principle. The time of picture change is constant, no matter what the speed of projection.
The second difference is that instead of projecting at a speed of 16 pictures per second we immediately drop to 4 pictures per second, and sometimes even lower. It might be stated offhand that such a low speed of projection could not possibly portray natural movement. In fact, the writer has heard this remark made by quite a number of cinematograph engineers, but the fact remains that it is possible to attain reasonably natural movement at such a low speed when working on this system, which increases the time during which each picture is on the screen, and decreases the time interval of change.
Assuming this to be true we find that the cost of film is one quarter that of 16 pictures per second, the standard adopted for silent work, and one-sixth that of 24 pictures per second. The cost of film subjects drops very low, and we understand that it would be possible to place complete sound film subjects on the market for outright sale at a price tentatively fixed at 4s., including both film and disc.
There are several other factors in the system which make for its success. There is, for instance, the elimination of the shutter by means of an ingenious device. At a demonstration the writer saw films projected on a 4 ft. screen, and the illusion was certainly good, and only in rare instances could it be detected that a lower speed than standard was adopted.