Page 184

I I I - - 
   TROUT LAKL 
~70 
I I I 
o CLEAR ' CLOUDY 
1 —- 
8 
. . 
eJ 
.5~ 
.4~ 
~30~ 
V U ~ o 
0 0 
TRANJM!ss/oN OP 1/vt. OP WA TER 
0 
AM 
0 
7ItANJM/JS/ON fROM &/RPACE 12? IM. 
 T~M~ 
8 0 0 1 IC 
 I  I 
3/X 
C 3 4 5PM 
I I I I 
 184 Wisconsin Academy of Sciences, Arts, and Letters 
covered and uncovered frequently by clouds, energies represented by individual
points were added up for a period of about a half-hour and average transmissions
calculated. Such values could not be weighted highly because of the greater
probable error of -individual points; however, these values did not differ
materially from others found. - 
 The first transmission curves drawn, shown on Figures 4 to 7, are averages
from many records. In any one day there are variations brought about by such
natural causes as haziness, waves, and intermittent clouds; it was thought
that experimental errors would average out arid regular trends become more
apparent. 
 ~ -o_a~. ~ 
 - 8 
FrG. 4. Transmission for Trout Lake, July 1935. 
 The results for Trout Lake (Figure 4) were based on records for nine days;
five of which were clear, two were partly clear, and on two the sky was evenly
clouded. Results for Crystal Lake (Figure 5) were based on records for eight
days, clear and cloudy weather being about equally divided. Results for Boulder
and Muskellunge lakes (Figures 6 and 7) were based on one clear and one cloudy
day for each. After the work on Crystal Lake the time remaining was short,
but it was found that one good clear day record and one good cloudy day record
were sufficient. As it happened, iecords for both Boulder and Mus