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22
The Journal of the Association of Cine-Teclinicians
Aviijiist, 1935
the same time the art is developing so extremely rapidly that methods are changed and improvements effected even within the space of a month or so.
The Crystal Palace studios of Baird Television are the only fully-equipped studios in the world to deal with this subject in all its aspects. Indoor and outdoor scenes and talking films are all transmitted, and received on home receivers with excellent results throughout the Greater London area. The entertainment value is ample for the home ; it remains now to make as much progress as possible from the manufacturing and commercial point of view.
In the case of the cinema the studios are also used for transmitting scenes for projection on to the full-sized screen. Results so far achieved can be said to be definitely better than the cinematograph pictures thrown on the screens of cinemas twenty years ago.
It is only a matter of time and hard work before television pictures of news items and national events will be transmitted from some distance away and projected on to the screens of cinemas, with all the definition, tone, quality and freedom from flicker characteristic of present-day projection of the best films.
The Spotlight Transmitter By j. d. Percy
The popularity of the spotlight method of scanning is undoubtedly well deserved, for probably no other method is so straightforward, and, while with this system of scanning the transmitter is limited in its application, it is, nevertheless, capable of producing within those limitations results second to no other system.
In case the theory of the spotlight scanner is not yet known to the reader, a short resume of the function of this method of transmission may be of help.
Briefly, in a spothght system the subject is placed in front of a mechanism which causes an intense spot of light to traverse his features in consecutive strips.
Taking a typical process, step by step, the spot would first of all cross from left to right at the highest point on the subject it is desired to transmit, say about two inches above his head.
As this first spot moves off, having crossed the complete picture, another appears at the left and repeats the process, just lapping below the path taken by the previous spot.
This goes on until the whole picture has been traversed, the number of spots into which the field is divided depending of course upon the number of lines it is desired to transmit.
The whole picture is covered by the flying spot from twelve-and-a-half to twenty-five times per second, depending upon the amount of flicker which is permissible.
To go a step further, the light reflected off the subject at any instant depends upon whether the spot is traversing a bright or dark portion. This varying reflected light is then, of course, picked up by the photo cells, amplified, and sent to the receiver by anv prcTdetermined method as an electrical waveform, which is utilised to modulate the receiving apparatus.
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