action through clear water
1st Exposure
action through turbid water
147 1
=
152 1.037
172 1
181 1.052
2nd
9)
3rd
204
212
1
1.055
1
39
1
Mean =
1.05
4.982
The photographic light passing through the clear water = = 4.70 times that 1.05
passing through the turbid water.
Using the formula I' = Ie - MY log 4:7 = 1.54756 = 17p1 Hi= .910 for each inch of turbid water.
The optical measures of the light passing through the clear and turbid cells in the w o directions were 3.15 inches clear water, 48.5; turbid water, 18.2. 1.7 485; 28.5.
Taking the measurement of the light passing through the 3:15-inch cell as lying on the curve in the formula I' = Icy, log 48.5 - log 18.2 = u X 3.15, Mi 311.
If we take the measure of the 1.7-inch water, we have
log 48.5 - log 28.5 = M X 17, M = 313. Mean value = 312.
Now mean value of x = .9105. Now A- 105 My u 14 therefore A-+ -9015 312 x 105 = 306.6.
