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J. A. MAURER
[J. S. M. P. E.
different. As we make prints denser than those which have maximum sound output the darkening of the clear side of the track depresses the noise level at a fairly rapid rate, while the continuing increase of density on the dark side keeps the general output level from falling so rapidly. The result is that up to a fairly high density of printing the ratio of maximum sound to ground noise level is improved. This effect is shown in Fig. 5.
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.2 ff .6 .8 AC /.2 /•* '-6 /-8 2.0 2.2
DENSITY OF PRINT SOUND TtfflCK
FIG. 5. Volume range as affected by print density considering only ground noise caused by dirt on prints.
On the basis of Figs. 4 and 5 it seems reasonable to draw the following conclusions:
1. The negative density should be kept above 1.0 for best results, but there is no need to work for very high densities.
2. Negatives denser than 1.0 should be printed so as to obtain a density of about 1.3 in the print.
3. A negative having a density of 0.8 should be printed to a density of about 1.1 ; a negative of density 0.6 should be printed to a density of 0.9; others in proportion.
4. The sound output from a negative of density 0.8 will require the gain control to be advanced about one point in order to equal the output from one of density 1.0; a negative of density 0.6 will require that it be advanced two points. This is, of course, on the assumption that the recording is all done at the same amplitude.
These conclusions are based solely on the consideration of volume