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276
E. D. COOK
[J. S. M. P. E.
which shows the time cycle of events in the standard motion picture sound-film and the same film as used in television.
It will be essential that the drive shaft to the intermittent movement in question rotate at the same speed that an otherwise standard motion picture device would be forced to use to project two
NUMBER OF FILM FRAME
STANDARD SOUND FILM CYCLE
ELAPSED] NUMBER
TIME | OF IN .TELEVlSIOn SECONDS FRAME
TELEVISION CYCLE FOR STANDARD FILM WITH 7.570 ILLUMINATION TIME
ELAPSED TIME IN SECONDS
ILLUM.
.OOOO
ILLUM.
.01 04
DARK
a
DARK
1
SCAN
0 1 67
1
.0208
ILLUM.
O 1 79
ILLUM.
.0313
XDARK a SCAN// ^ a //
MOVE 1 FILM FRAME
///n ' L* /. / /s
0333
// ft V/
ILLUM.
0346
/^MOVE.//^
..0417
DARK
ILLUM.
.0521 2
a
SCAN
.05OO
0
DARK
.0625
DARK
a
.05 1 3
SCAN
0667
ILLUM.
ILLUM.
.0729
•///r\/o ' a? e^ ' ' '' /
^0*a^
J0833 ,
// a x^
MOVE 1 FILM FRAME
3
ILLUM.
ILLUM.
.0938
DARK
DARK
SCAN
1 GOO
.1042
ILLUM.
1 O 1 3
ILLUM.
.1 146
/'DARK V SCAN^ MOVE 1 FILM FRAME
.1167
/, OL //
ILLUM.
1179
•%MOVE///
.1250
DARK
ILLUM.
a
SCAN
.1 333
ILLUM
1 346
DARK
. 1458
DARK
a
5
SCAN
1 5OO
ILLUM.
ILLUM.
1513
!«?£!
. 1667
/DARK a S'CAN"/^/
MOVE 1 FILM FRAME
IP67
FIG. 2.
Time cycle comparison for motion picture film in television and theater projectors.
film frames per revolution of the equivalent shaft. In the usual projector (and this applies to the standard model E-7 used here) only one frame is projected per revolution. Hence, this drive shaft normally revolves at 1440 rpm.
In the design of the modified machine, this would call for the inter