Movies for TV - Early Television Foundation

126
FUNDAMENTALS
Fig. 5-1. NBC kinescope recording equipment being adjusted
by O. B. Hanson, Vice-President of NBC.
depend on some form of device, either electronic or mechanical, to
shut off the light at certain times, i.e., an electronic or mechanical
shutter system. The Eastman Kodak Company has developed
equipment for NBC and the Dumont network which does a very
satisfactory job. In this case, a mechanical shutter is used. In the
author's opinion the electronic shutter requires more work on
cathode-ray tube phosphors. No mechanical shutter is used to cut
off the light after each desired exposure in this system. Therefore,
if the phosphor has a long decay time instead of the light being
sharply cut off every time,
it will fade and leave a faint blur on the
film. Of course, as progress is made in phosphor composition, the