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Aug. -Oct., 1936
The Journal of the Association of Cine-Technicians
37
heat-absorbing glass between the condenser and gate. Both this glass and the film itself are cooled by streams of air supplied by two properly located fish-tail nozzles.
While it is unfortunate that theatre projection conditions cannot be exactly duplicated in this set-up, the author feels confident that the modifications described above introduce no considerable error into the density measurements.
A list of all of the results obtained in this experiment would be too voluminous to justify printing in the Journal. However, a typical page of data is shown in Table I. The columns, with the exception of the second, need no comment. In the second column an attempt has been made to classify each scene according to its type, "Close up" (CU), "Semi-close up" (S-CU), or long shot (LS). Each scene has also been designated as "Exterior" (E) or "Interior" (I). Items 5, 14, and 21, which are night scenes, have been marked with an asterisk.
It was at first thought that some correlation might be found between the scene type and its optical characteristic.
TABLE II.
Summary of data regarding
release
print measi.
rements.
Diffuse.
Projection
Highest Dmax measured,
2-46
3-2
Lowest Dniin measured.
015
0-19
Highest Dav measured,
. —
L9()
Lowest Dav measured.
—
0-67
Highest Dp measured,
—
1-60
Lowest Dp measured.
—
0-60
Highest Contrast Scene,
—
2-45
Lowest Contrast Scene,
—
1-38
Average Dmax
1-85
2-4
Average Dmin
0-33
0-43
Average Dav
—
115
Average Dp
—
0-99
Average Contrast, ...
1-44
1-87
If anj exists it has not yet been uncovered.
In Table II. an attempt has been made to give the salient points regarding all of the data.
In dealing with statistical data of this nature, graphical presentation offers a ready means of getting a composite picture of results. A few of the possibilities are illustrated in Figure 2, in which the projection density values of Dmin, Daverage. D^ax, and Dp are shown as a function of the frequency with which the various values occur.
Discussion.
An analysis of the significance of these data is beyond the scope of this report. A few general statements concerning the sensitometric interpretation are, however, of some interest.
_" Sic '*iet IS
soowArr
Fig. 1.
Optical system used in making projection density measurements.
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