ee er 
EF. Loomis— Observations of the U. S. Signal Service. 18 
metric oscillations represented on Plate II, the wind on Mt. 
Washington never blew from the S., 8.E., E. or N.E., and 
the same is true of the four minima in the months of May and 
June, 1873, mentioned on page 9. Thus we see that areas of 
low barometer frequently occur accompanied by surface winds 
from the south and east, while the winds on Mt. Washington 
blow uninterruptedly from the western quarter; and in those 
cases in which the wind on Mt. Washington blows from an 
eastern quarter, the change from west to east generally occurs 
first at the base of the mountain. 
It is also noticeable that the diurnal movements of the barom- 
eter exhibit a peculiarity similar to that found for the acci- 
dental fluctuations. This is shown by the following table, 
Mean height of the barometer at all hours of the day. 
Mount Washington, New Hampshire, ! i 
Cc, 
Month of June. Month of May.| May and June, August. 
Stat’n 1/Statn 2 *n 3 Stat’n 4!Stat’ 1 t’n 4) Sum’t | Base. || Sum’t.| Buse. 
1A.M.]23-818)24-512/25-979|27-179| 23-702 27-152/23°760)27°165||23-720/27-355 
2 815) °51 975| -173| °699| -°149] -75%| -161|| -714| °351 
3 806} -508} -971 70} -696| -147| 751} °158}} -T11) °347 
4 8 11} -976| -175| -690| -146| °746| °160|| -70 9 
5 805} 513) 982! -181) -701| -150| °7 165|| 713] °357 
6 513| -987| +189! -701| -158|~ °756) -173|| °720| -368 
7 817} 520} -993| -196) -707 7 80|| 31] -373 
8 821) +527; -996| -196| -714; 166: ‘767, -181|| -739| ‘378 
9 8 532] -998) -196 718! 166| ‘773| °181|| -748| 379 
10 838} 536} -999| -196| 725) -165| °781| °180|| -753) ‘374 
1 83 33] -997/ -190| -731| -162 16|| °753| -363 
noon | -841| -532| -992| +182) -733| -156| -787| °169)| -746 
1PM) -839] +532) -985| -177| -731| -149| -785| 163 4} +345 
: 2%| -985| -171| -732| -143| -783| -157|| -730| -333 
3 830} +528} -976) -161| -725| -142| ‘777| °152|| -726) 330 
4 825| 521) -973| 158! °726| -142| °775| °150/| °719| ‘321 
5 817| 520} -973| +159! -794) -147| -771) 150!) -717) °323 
6 822) 517] -973| +156! -721) °1 1] *155|| -717| -329 
7 818} 523] -976| -165) 162} -772| *163|| -723| -345 
8 818! -522/ -980| -166| “727; -166| ‘773| ‘L66|| “730! “360 
9 826) 531) -984) +173 170] °779) 171) 137) | *361 
id 823} -522| -983} 172) -727| -170) “775| *171/| -739) “861 
il 821} -522/ -987 174| 720) -169| -770| -171|| -736| 360 
midn’t| -815| 516] -978| -169, 716) -165| -765| -167||_-728| “365 
Which gives the results derived from the hourly observation 
published in the Signal Service Report for 1873, Column = 
June. Column 8d shows the mean height of the barometer at 
Station 2 (5,558 feet above sea level); column 4th shows the 
barometer at station 8 (4,058 feet above the sea); and column 
