Birge—A Second Report of Limnological Apparatus. 547 
TABLE 3 
Observations with pyrlimnometer. Hector Point, Seneca Lake, New York, August 1, 1918 
Hour 
Depth, cm. 
Zero 1 
Reading 
Deflection 
Cal. cm. 2 min. 
12:50. 
0 
10.5 
127.8 
117.0 
1.30 shunt in 
10.0 
126.7 
12:55. 
25 
13.5 
83.0 
70.3 
0.41 shunt out 
13.0 
84.0 
19;57. 
50 
13.0 
77.0 
64.0 
0.38 
13.0 
77.0 
12 58 ... ... 
100 
12.5 
59.5 
47.3 
0.28 
12.5 
60.0 
12:59... 
150 
12.5 
50.5 
38.5 
0.23 
12.5 
51.5 
1:00. 
200 
12.5 
45.8 
33.2 
0.20 
12.2 
45.5 
1:01. 
250 
12.2 
40.6 
28.3 
0.17 
12.0 
40.2 
1:03. 
300 
12.11 
35.8 
24.1 
0.14 
12.0 
36.5 
1-05. 
350 
12.3 
32.3 
20.0 
0.12 
12.1 
32.1 
1:07.. 
400 
12.1 
29.2 
17.1 
0.10 
12.1 
29.2 
1:09. 
500’ 
12.2 
24.2 
11.9 
0.07 
12.2 
24.0 
12.1 
1:23. 
1,000 
12.2 
14.5 
2.2 
0.013 
12.2 
14.4 
12.2 
14.4 
12.4 
snow and by water which has been filtered or otherwise treated, 
and whose transmission of the sun’s radiation can be studied in 
a tank. 
III. The Kemmerer Water Bottle, Modified Form (Plate XL, 
figures 6, 7) 
In 1910 this Survey had a water bottle constructed after the 
well known design of Petterson. This was loaned at a later date 
to the United States Bureau of Fisheries for investigations by Dr. 
G. I. Kemmerer who used it in the deep lakes of the western 
United States. It was lost in one of those lakes by the breaking 
of the line, and in order to go on with his work Dr. Kemmerer 
devised and had made a simple form of bottle, employing a brass 
tube with rubber stoppers for its ends. The parts were brought 
