Instrument 
-2- 
Pressure 
Correct 
Reading 
Inches 
Feet 
Beet 
Mer cury 
-690 
30.63 
+35 
- 75 
29.95 
+30 
230 
29.64 
+ 5 
1895 
27.88 
+ 5 
2830 
26.96 
-15 
3835 
25.98 
-15 
4970 
24.92 
-20 
5820 
24.15 
-15 
7045 
23.07 
+ 5 
7920 
22.34 
0 
8935 
21.53 
-10 
9545 
21.06 
-20 
8690 
21.73 
-15 
6920 
23.17 
•*•10 
5940 
24.04 
-10 
3985 
25.83 
-10 
3085 
26.71 
-20 
2065 
27.72 
- 5 
1090 
28.73 
- 5 
195 
29.67 
+15 
Summary. 
This instrument has unusually small scale and elastic 
errors. 
George K. Burgess, Director 
Vfashington, D.C. 
April 7, 1930. 
