152 THE ALTITUDE OF MOUNT ADAMS, WASHINGTON 
inometer by subtracting three degrees. Parallel readings, taken 
iit Trout lake and Mountain View camp, of the attached ther- 
mometer and the air thermometer, before the latter was broken, 
gave readings of the latter 2° and 3° below the former. The 
belief that the reading on the summit of the mountain on the 
-afternoon of the climb would have been in the same proportion 
is strengthened h}^ the fact that the air temperature shown by the 
nir thermometer used with the boiling-point apparatus closely 
corresponded with my air temperature obtained in the manner 
above stated. 
OBSERVATIONS. 
Portland, Oregon. 
Seattle, Washington. 
State Weather Bureau, July 10, 1895. 
P. M. 
Barograph. 
Thermograph. 
1:00 
29.80 
90 F. 
2:00 
29.79 
92 “ 
3:00 
29.77 
93 “ 
Pref-sure figures corrected for tem- 
perature. Barometer 157 feet above 
sea level. 
B. S. Payne, 
Director. 
Eugene, Oregon. 
Univer 
sity of Oregon, 
July 10, 1895. 
P. M. 
Standard 
Exp. 
barometer. 
thermometer. 
1:00 
29.380 
93.5 
2:00 
29.374 
94.0 
3:00 
29.361 
95.0 
Weather Bureau, July 10, 1895. 
P. M. 
Barograph. 
Thermograph. 
1:00 
29.875 
85 F. 
2:00 
29.865 
86 “ 
3:00 
29.850 
87 “ 
Pressure figures corrected for tem- 
perature. Barometer 119.4 feet 
above sea level. 
George N. Salisbury, 
Observer. 
Summit of Mount Adams, Washington. 
Mazama Expedition, July 10, 1895. 
P. ii/. 
Barometer 
Air 
No. 1612. 
temperature. 
1:00 
19.256 
38.0 
2:00 
19.272 
38.5 
3:00 
19.281 
43.0 
Pressui’e figures corrected for tem- 
perature. Barometer 485.7 feet 
above sea level. 
S. II. McAlister, 
Observer. 
Pressure figures corrected for tem- 
perature. Cistern of barometer 1.1 
feet above the level of snow. 
The calculations were made h}^ two methods — by iMajor R. S. 
M’illiamson’s tables, based on Plantamour’s formula, and by 
Guyot’s tables. In the former case, since no observations were 
taken to determine the humidity of the air, the temperature cor- 
rection Avas calculated by the formula of La Place. Three esti- 
mates Avere made on each place as a base from observations taken 
at 1:00, 2:00, and 3:00 o’clock p. m. This gives nine estimates 
