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Jan., 1930]
WIDE FILM STANDARDS
69
of higher frequencies than is possible on the present standard sound record length. It is also quite apparent that a wider sound record would permit an increase in the volume of sound during reproduction. Increases in the length and the width of the sound record involve, indeed, many problems and considerations which we hope will be brought to the attention of this Society. We may, nevertheless, mention that the advisability of separating the sound record from the picture record, not only during the process of recording but also during that of reproducing in order to record higher fre
DIA. OF CIRCLE DIA. OF CIRCLE DIA OF CIRCLE
30.03 MM 1.1823" 35 20 MM 1.386" 43.74 MM -1.722 "
AREA OF CIRCLE AREA OF CIRCLE AREA OF CIRCLE
7.083 CM2 9.736 CM2 15.03 CM2
1.098 SQ.IN. 1. 509 SQ. IN. 2.329SQ INI.
PROJECTOR APERTURE PROJECTOR APERTURE PROJECTOR APERTURE
22.99 MM X 17.26 MM 28.76 MM X 17.26 MM 35.53 MM X 21.31 MM
.906"X .6795" 1.1325" X.6795" 1.3987" X.6392"
DIA. OF CIRCLE
53. 42 MM 2.103"
AREAOFCIRCLE
22.41 CM2
3.474 SQ.IN.
PROJECTOR APERTURE
43. 31 MM X 26 MM
1.705" X 1.0236"
FIG. 5. (1) Area of aberrationless covering power of photographic lenses required for 35 mm. and larger area films. (2) Focal lengths required to cover larger images compared to a 50 mm. lens with 35 mm. film image.
quencies than those which are obtained today, has been expounded and supported by arguments of both technical and economical nature.
In considering the changes of Dimensions in the sound record, Bell & Howell engineers have kept present in their minds the possibility of new developments. The proposed new dimensions and position of the sound record offer the advantage that such alterations, in either the direction of expansion or contraction, would require but little, if any, mechanical modifications in the apparatus constructed according to the new proposed standards.