E. Loomis— Observations of the U. S. Signal Service. 5 
Barometer below 29°7 inches at San Francisco. 
g | wInD. | g8| dz Origi- | High on East side. | Reached At’ic. 
No. Date. 2 Teo] Bb Station. nated 
& |Direc.|vel.|"Z | 32 where-| Bar.| Station. Date. | Lat. 
1872. 
1 Dee. 28.2/29°68/S. EK. | 14 |0-11|29°68 San Francisco) Pac. O. piso ae Dec. 31} 43° 
1873, 
Jan. 31.2} °55/S.E. | 20] 04) °55 San Francisco|Pac. O.| ‘78 Breckenridge |Feb. 5) 45 
31 60'S.W.| 4} -28} °60 San Francisco 85 Breckenridge 
24 Feb. 1.1) -65/N.BE.| 4| 0] -65.San Francisco 95| 
1.2] -64iN. 4| 0} ‘64 San Francisco *82 Leavenworth 
1.3) 67/8. 8| -02; °67 San Francisco “14 Da rt 
Feb.24.1} °61)W. 8| °05| °49 Corinne Pace. O. 35 Fort Sully Feb. 28} 43 
3 24.2| “60;W. | 16 0} ‘41 Corinne 28 Fort Sully 
24,3 W. |12] 0} -38 Corinne *36 Fort Sully 
4 July 1.3) ‘70|\8.W./12| 0] ‘59 FortG Can. 18 Lake City [July 6| 45 
Sep. 68'5.W.| 8 0| ‘14 Fort Sully C 3 Hali 
P 26.1 -66/S.W.|12| 0) -25 Breckenridge 21, Was D 
26.2; -66S.W.|16| 0) ‘20 Fort Garry 2 y 
26.3) °68/S.W.| 12 0| ‘53 Fort Garry 26 Philadelphia 
Dec. 3.3) °67/S.E. | 20/ -76) -66 Cheyenne Pac. O.| 28 Charleston (Dec. 9} 48 
4.1! *63/N.W.| 16! *72) °63 San Francisco 42 St. Loui 
4.2) ‘57/8. | 20] -08) | -57|San Francisco| "39 Cairo 
6 4.3! °55/S. 20| °0. ‘55 San Francisco -b5 Fort Sully 
5.1; °62!S. 8| °99 ‘62 San Francisco "65 Fort i 
Tl 08.8 8| °25 61 Corinne “11 1 Kin ngsto: 
1.3) “67/S.E. | 4] -07| -66 Cheyenne ‘T1| Montreal 
ah *69\Calm|} 0} 0 9 San Francisco 76 Chatham 
Jan.15.3) -55/8. 28] 3 *23/ Portland, aa Br.Col.| °58Davenport Jan.19) 44 
16.1; “58/8.W. | 24 2! °11)Portland, 49 Louisville 
7 16.3] -67/S.W.| 8| 0] -14\Fort Pain fe pessoas 
17.1) -56/S. | 24] -41| -00\Fort Garry -56 Lynchburg 
17.2} °63/S.W.| 16] -35| -25\Fort Garry “56 Philadelphia 
8 Feb.12.i) -70|S.W.| 12] -07| -15|Leavenworth |Br.Col.| -24 Brockville |Feb. 14] 50 
9 9 Apr.11.1| 11.1) “70/W. |16| 0} -62/Salt Lake City|Pac.O.| -45 Pembina Ap. 16! 48. 
In nearly all of these cases there was an area of high barom- 
eter on the east side of San Francisco at an bayer: istance of 
1500 miles. In one case the barometer to 30°95 inches, 
and in two-thirds of the cases it was as high as 80°36 inches. 
In No. 4 a moderate depression of the barometer extended over 
the entire United States, with the exception of the southeast 
portion. This low area continued to cover a considerable ol 
of the United States without much change during a peri 
on in ion }, ACCOUNE 
uncertainty attending the reduction of the mountain ob 
tions to the level of the sea, the progress of the barot 
is best exhibited by the changes of pressure, withed 
