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TELEVISION TODAY
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FIGURE 67
9" color television receiver; top view, open.
plitude, it is then sometimes possible to eliminate it by injecting a similar hum in opposing phase. Interference also is sometimes produced due to electro-static charges which accumulate on the rapidly moving color discs. Movement of the scanning lines is sometimes caused by variation in the charge over the surface of the disc as the disc rotates. It is possible to remove the charge with a semiconductive coating on the cathode ray tube face, or by other means.
Color discs have been made of metal or of transparent plastics such as lucite. plexiglass, etc. Wratten filters are available coated on 10/1000" acetate stock which can be riveted to the metal or plastic disc. The disc may be rotated by a synchronous motor, or by an asynchronous motor with auxiliary synchronizing means. Owing to lack of synchronism between the power supplies of New York, Connecticut and New Jersey, and also to the lack of standard synchronous motors of 1,200 revolution per minute type, it was found desirable to drive the disc with an inexpensive induction type motor and synchronize it by a phonic motor, or a magnetic brake. A photograph of a brake assembly as used on a 7" color television receiver is shown in a rear view in Figure 68. The induction motor driving
FIGURE 68 7" color-television receiver showing synchronizing brake and driving motor assemblies.
Bausch & Lomb Projection Lenses
FOR CLEAR, BRILLIANT SCREEN IMAGES THAT
Audiences Appreciate
Super Cinephor f:2.0
Bausch & Lomb high light-transmission lens surface treatment means that more light reaches the screen to provide greater screen brilliance. Coupled with superb anastigmatic correction it means unequalled image quality, color purity and contrast.
Cinephor Series II
The Cinephor II provides in the longer focal lengths the advantages in projection efficiency associated with the Super Cinephor. Available in focal lengths of 5%" to 9".
Cinephor Lenses f:2.0
A moderately priced high speed lens with excellent correction, available in focal lengths from 3.5" to 5.0" inclusive. All focal lengths in No. 2 barrel.
Cinephor Series I
Long recognized as the standard projection lens in American theatres and as being excelled only by the Cinephor and Super Cinephor Series.
Bausch & Lomb Cinephor and Super Cinephor Lenses are sold by National Theatre Supply Co. and also leading independent theatre supply houses.
Bausch &l Lomb Optical Co,
616 St. Paul St., Rochester, N. Y.
Established 1853
CLAYTON BALL-BEARING
EVEN TENSION TAKE-UPS
For all projectors and sound equipments
All take-ups wind film on 2, 4 and 5 inch hub reel*. Silent Chain Drives
THE CLAYTON REWINDER
For perfect rewinding on 2000-foot reek.
CLAYTON PRODUCTS CO.
31-45 Ttbbett Avenue New York, N. Y.
SEPTEMBER 1944
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