266 Meteorological Observations at Hudson, Ohio. 
Art. IV.— Meteorological Observations made at Hudson, Ohio, 
Lat. 41° 14/ 42” N., Long. 5h. 25m. 40s. W., during the years 
1841, ’2, 3, and ’4, with a summary for seven years ; by Eras 
Loomis, Professor of Mathematics and Natural Philosophy in 
the University of the city of New York. 
In Volume x11, pp. 3L0—330 of this Journal, is given a sum- 
mary of the Hudson observations for 1838, ’39, and ’40. It is 
now proposed to continue this summary, and append the average 
results for seven years. The position of the instruments has 
throughout remained unchanged, and the same hours of obser- 
vation have been adhered to. During the past four years, not a 
single observation, except of the hygrometer, has been lost. 
They were all made by myself, with occasional exceptions, until 
October, 1843, from which time until July, 1844, they were made 
by Mr. S. T. Seelye, a graduate of Western Reserve College. 
Those for August and September were made by Mr. Lemuel 
Bissel, and those for the next five months by Prof. Nooney. 
The year is considered as commencing with March. The fol- 
lowing observations of the barometer, are all corrected for capil- 
larity, and reduced to 32° F. 
BAROMETER. 
Months 
March, '28°783|28'751|28°848)28: 28:797|28'768|28'728 28-806 28:773/28°793 28-751 og 192) -209/28-601 
April, 
May, 
June, 
July, 
Aug., 
Sept., 
Oct., 
Nov., 
Dec., 
Jan., 
Feb., 
Year, 
n 
Mean of 
1841. 1842. 1843. 1844. seven years. 
oscillatio 
9am.(3PM.|9a.u.] 3P.M.|9a.m.]3P.m.|9a.m.|3P.m.|9am.! 3pm. |7 3 9a.m.|3P.m.| 9 a.m. 
pital 
786] -737| -737| -687| -767| -729| -933) -882| -806, -761-045) -288} -315) -518 
792) -754| 784) °755) -796|} -'751) °814) -755| -769| -725-044) -372) -389) +397 
-789| :748] -783) 742) -805] -773) -848) -804) °792| “755 -037| -541) -582) -251 
-874| -828] -910} -879| -878] -837| -796] -777| °856, +822 -034) -636| -664) “220 
-926| -878| -919} +885} -909) -873) -779| -754| -876) -838-038) -601| 638) 275 
-829] 783] -903} -858} -900} -847] -936| -895| °893; -846 047) -491| 527) -402 
886] -841| -866} -809} -763|/ -738| -875| -832| ‘858) -812-046) -308) 324) -550: 
“781| -744| -842) -800} .898) -870) -827| -775| -851| -806 045° -197| -208) -654 
-790| *757| :864) -821) .879) -838|) -767| -723) -812; -774-038) -160) -166) -652; 
-774| -737| -815| -'784| -789| -762) -812) “774| -823) -785-038) -146} -154) -677 
780} -729| °741| -701) -876| -826| -796| -'742) °817| 767,050) -148) -161) .669 
Pressure of} Gaseous at- 
the vapor. | mosphere. 
28-829 28787042} -340] -362,28-489 
The mean diurnal oscillation is for spring 0437; for summer 
‘0363; for autumn :0460; and for winter ‘0420. It is least in 
summer and greatest in autumn. Average for the year -0420, 
differing but slightly from the results of the first three years. 
The mean pressure at Hudson for the seven years is 28-808. 
The reduction to the level of the sea is given below, to which I 
