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354
J. I. CRABTREE AND C. B.
[J. S. M. P. E.
were skipped before another splice was made. The first splice was left bare, the second was covered with the patch, and then 5 feet beyond the second splice a patch was mounted at a point where there was no splice. In this way each of the patches in the table was prepared for test. In order not to have any bad corners it is desirable to avoid cutting across perforations so that the choice of lengths is limited.
TABLE I Experimental Patch Dimensions (See Fig. 4)
Patch No.
A
B
C
1
0.09 in.
0.29 in.
0.10-0. 12 in.
2
0.1875 in.
0.65 in.
0.10-0. 12 in.
3
0.1875 in.
1.00 in.
0.10-0. 12 in.
4
0.1875 in.
1.40 in.
0.10-0. 12 in.
The tests were made by running these strips through a standard type of reproducer operated at a normal gain setting. The modulation of the oscillator record was such as to produce at this gain setting a volume corresponding to normal speech. The noise from a well made splice, made with a widely used mechanical splicing machine, was plainly audible.
In general, the noise produced by a plain splice was least noticeable in the oscillator records, more noticeable in the 0.7 density, and most in the 0.1 density film. The patch number 1 produced a plainly
0 D 0 D 0
FIG. 4. Dimensioned sketch of patch.
audible sound, number 2 was somewhat less loud, and numbers 3 and 4 were only just audible on the 0. 1 density film and apparently about equally effective.
Numbers 3 and 4 were noticeable because of their obscuring the oscillator record for a perceptible duration of time. Number 2 did