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.
88 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
ary motion pictures was successfully accomplished by station WCFL, Chicago, a 48 hole scanning disc revolving at 900 revolutions per minute being used.^^°
Direct scanning of subjects by a moving beam of light is claimed to permit the use of a very intense transient illumination and more than one large aperture photo-electric cell to collect the reflected light.""
A new type of scanning device for television transmission and reception has been annonnced."^^ The device is based on the use of a circular disc which is so mounted that it can be rotated simultaneously both about its center and about one of its diameters. The disc is mounted in a forked support in which it can be rotated at a high speed, and then the base of the fork is mounted in bearings so that the fork and disc as a whole can be rotated at some other speed. On the periphery of the disc, photo-electric cells are mounted, depending on whether the device is to be used for transmission or reception. An odd number of these tubes is used, five being suitable, the tubes being spaced at equal intervals. It is claimed for this system that any degree of definition of the received image may be attained with ease. It is also stated that an image as large as that of a moving picture can be reproduced with the same degree of clearness.
A description of a process of television in natural colors has been published.^°® Three exploring spirals, each covered by a daylight filter are arranged consecutively around one scanning disc. The filters transmit green, red, and blue light respectively, the subject being scanned first by a red spot of light, then by a blue spot and last by a green spot. The receiving station has a similar disc in synchronism with the transmitter and includes a neon tube (red) and two separate glow discharge lamps made J^om a combination of helium and mercury vapor (blue-green). ;
Several patents have been issued mainly in Great Britain on television apparatus."^°
Z>. General Recording
The ''cavitation" or movement of bubbles along the surface
of propellor or turbine blades has been photographed by reflected
light from the bubbles."®^ A unique 15 horse power motor (8 cm. by
28 cm.) was developed for driving the camera. Fleming"^" has de