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284
CRABTREE, SANDVIK, AND IVES
[J. S. M. p. E.
without harm as shown by test No. 91. Excellent results were also obtained by cleaning and re-treating a film originally treated with cantol wax, buffed, and solution edgewaxed although, if a film is not given abusive treatment during use, this repeated treatment should not be necessary.
The results shown by tests Nos. 107 (oil treated and buffed) and 111, in which a solution of oil and paraffin wax was used instead
TABLE IV Relative Ground Noise Intensity
Number of Runs
Sample
0
10
20
30
40
50
82
130
CF
100
100
100
100
100
100
100
100
91
0.30
0.45
0.70
0.78
0.90
0.92
1.03
1.20
92
0.37
0.50
0.63
0.75
1.10
2.20
3.60
5.13
93
0.45
0.77
0.90
0.98
1.05
1.10
1.25
1.45
94
0.27
0.60
1.45
3.65
4.77
5.50
6.80
7.75
95
0.30
0.80
1.12
1.35
1.56
1.75
2.25
2.83
96
0.20
1.75
2.65
3.30
3.82
4.35
5.85
7.90
97
0.30
1.48
2.45
3.20
3.85
4.40
5.86
7.45
100
0.45
0.95
1.65
2.45
3.22
3.93
6.01
8.90
101
0.28
2.02
2.60
2.83
2.94
3.03
3.20
3.33
102
0.30
0.48
0.61
0.75
0.85
0.93
1.10
1.25
103
0.50
3.45
4.67
5.47
6.02
6.43
7.30
8.05
106
0.50
0.90
2.35
3.45
4.28
4.85
5.81
6.33
107
0.32
0.88
1.05
1.14
1.20
1.25
1.30
1.37
110
0.50
1.35
3.35
4.63
5.45
6.07
7.45
8.87
111
0.43
0.92
1.00
1.00
1.00
1.00
1.00
1.00
112
0.65
1.40
2.85
4.03
4.93
5.55
6.72
7.53
of the oil solution, were very satisfactory. Such processes, however, involving frequent re-treatments are objectionably complicated.
Preliminary study has shown that oily coatings tend to accumulate dirt somewhat rapidly and this is shown by a study of sample No. 107 before and after treatment.
Sample No. 92 is a rather interesting case in that a sufficient quantity of wax and paraffin remained on the film to offer protection until the fourth cleaning after which the ground noise increased to such an extent that a repetition of the original treatment was considered imperative after three cleanings.
It was concluded that the best treatment consisted in the application of a solution of cantol wax to the entire emulsion surface, buffing