Movies for TV - Early Television Foundation

FILM TRANSMISSION EQUIPMENT
l/12Sec.
720"
grees to measure the amount of travel or time elapsed is merely
a convenience for reference purposes, since irrespective of the time
elapsed, or work performed, one cycle is always 360, and in this
way it is possible to describe periods of operation in abstract
notation.
This method is also used for the GE 35 mm projector and in
a similar manner in the RCA 35 mm projector. Figure 4-7 shows
the time cycle for the RCA TP 35 B, and also the proposed time
cycle for the RCA 1 6 mm projector using this system.
RCA 16 mm Projector with Incandescent Lamp
103
In this type
of projector, a scanning sequence of twice and three times is also
employed. Because an incandescent lamp is used, it is not possible
to flash it electrically since the filament would not have time to
extinguish between flashes. Therefore, a mechanical shutter is
used. This is an eighteen-inch disc with a small slot cut in the
circumference. Since it is rotated at a speed of 3600 revolutions
per minute, there is one flash every sixtieth of a second.