- 2 - 
Results of Tests. 
For the series of ascending and descending readings, the 
following table gives the true pressures as determined by comparison 
with a mercurial barometer, the corresponding altitude, the reading 
of the instrument and the corrections. The corrections are to 
be added algebraically to the observed reading in order to obtain 
the true altitude. The altitudes corresponding to the pressures 
were obtained from Table 51 of the Smithsonian Meteorological 
Tables, Edition of 1918. 
Pressure 
Altitud e 
Instrument 
Correc 
Inches 
Table 51 
Reading 
Feet 
Mercury 
Feet 
Feet 
30.90 
-895 
-880 
-15 
29.92 
- 20 
+ 10 
-30 
29.85 
+ 45 
80 
-35 
28.92 
905 
975 
-70 
27.82 
1960 
2000 
—40 
26.84 
2935 
2980 
-45 
25.84 
3965 
4010 
-45 
24.90 
4975 
5010 
-35 
24.16 
5795 
5820 
-25 
23.13 
6980 
7015 
-35 
22.29 
7985 
8020 
-35 
21.44 
9040 
9060 
-20 
20.96 
9 655 
9 670 
-15 
21.52 
8940 
8970 
-30 
22.35 
7910 
7950 
-40 
23.25 
6835 
6900 
-65 
24.22 
5730 
5790 
-60 
24.94 
4930 
4980 
-50 
25.87 
3935 
3995 
-60 
26.87 
2905 
2970 
-65 
27.84 
1940 
2000 
-60 
28.60 
1150 
1225 
-75 
29.81 
80 
115 
-35 
G-eorge K. Burgess, Director 
Washington, D.C. 
February 13, 1931. 
