Pietenpol—Visible Spectrum of Wisconsin Lake Waters 571 
For the purposes of this investigation the results might as 
well have been stated in terms of the percentage of transmis¬ 
sion of light by a meter of water as in those of the coefficient 
of absorption. The method employed is that regularly used 
by physicists and is of advantage in certain types of com¬ 
putation. 
TABLE 1 
COEFFICIENT OF ABSORPTION. DISTILLED WATER 
Wave length 
Hxifner u. 
Albrecht 
Ewaii 
Aschkinass 
Aulsess 
Pietenpol 
4150. 
.0«b 
4300... 
.023 
4490. 
.028 
,012 
4500... 
.020 
4680.... 
.027 
.012 
4700.... 
.034 
4750..... 
.020 
4870........ 
.037 
.014 
4940... 
.002 
.030 
5000... 
.020 
5060.... 
.043 
.016 
.025 
5220............. 
,002 
.030 
5250... 
.015 
.5270. 
.045 
.019 
5370. 
.005 
5390... 
.022 
5500. 
,036 
5510... 
.075 
.023 
5580... 
.028 
.036 
5620... 
.030 
5750. 
.020 
5760... 
.114 
.039 
5790... 
.049 
.056 
5840. 
.048 
5870. 
.051 
5895... 
.096 
5900..... 
.070 
.089 
6000... 
.163 
6005.. 
.165 
6020................... 
.250 
.109 
.173 
6070.... 
.200 
6120......... 
.192 
.233 
6170.... 
!244 
6180..... 
.206 
6220. 
.239 
6250... 
.223 
6310.... 
.282' 
.130 
6360.. 
.225 
6370.... 
.229 
6430. 
.291 
6480.. 
.236 
6500.. 
.255 
6580... 
.320 
6620. 
.281 
6630.. 
.245 
6640... 
.393 
.173 
6750.. 
.329 
6800...... 
.210 
6870... 
.371 
6900...... 
.251 
7000... 
.553 
