16 Curves of Barometric Progression. 
It will be seen that the above diagram includes a period of 
thirty-three hours ; and if we rate the progression at twenty-five 
miles an hour, it will comprise a distance of 825 miles. It con- 
tains the curve derived from observations on board the ship Eagle. 
I add the following condensed statement which is derived from 
the abstract of the ship’s log sent me by Lieut. Maury. 
The clipper ship Hagle, Warren, from Rio, crossed the center- 
path on the morning of Sept. 7th, perhaps 350 miles in front of 
the axis of the gale, while running in the direction of Cape May. 
It is interesting to find that this vessel, which crossed the equator 
Aug. 17th, was overtaken by the external barometric wave 0 
the storm as early as 4th-5th of Sept., and by a lon 
coming up from S. £.; being then from 100 miles to 60 miles 
southward of Bermuda. Through the 6th, winds from southeast 
29°90, at noon, 29-84 in. lat. 37°17’, lon. 72° 28/: p.m. very 
threatening appearances from S. E. by S. to S. W., with a very 
heavy swell from S.W.; at 4 p.m. bar. 29°70,—at 5 p. m., 29:77; 
wind fresh from E. N. E. toN.; 8p. m., lightning at N. W.; at 
11 p.m, in a heavy squall, wind shifted to N. N, W.; no rain; 
heavy sea still. Sept. 8th, cloudy; no sea; lat. at noon, 
38° 38’, lon. 74° 13’; bar. 30 inches. 
The steamer Northern Light, bound for the Isthmus, was sev- 
eral hours ahead of the Georgia, and ona more eastern track. 
She crossed the center-path in front of the gale, and ran through 
i Sept. 7th, lat. 34° 30’, lon. 73° 25’; through 

its eastern side. 
the day, strong gales from the South; with a heavy sea from 
.W.—Sept. 8th, lat. 32° 01’, lon. 73°, strong gales from S.W., 
with heavy squalls, and a large sea from W.N. W.: Clear in 
the S. E., with stormy appearances in the N. and W.:——found 
the weather improving as we made south. This account is 
probably in nantical time. ; 
The succeeding diagram represents, in its horizontal scale, the 
distance of 840 miles between Washington and Bermuda. The 
full line (1) represents, approximately, the barometric curve 
through the center of the storm, transversely to its path. The 
comparison of this transverse curve with the central curve of pro- 
gression, indicated on p. 18, is of some interest; although we have 
no observations intermediate to the Swan and Bermuda. The re- 
semblance of the two central cross-curves may show that the storm 
was of nearly equal extent and force on all of its sides, at that time. 
I have been apprehensive of a clerical error in the barometric 
report from Fort Monroe for 3 p. m. and 9 p. m. of Sept. 7th; an 
that 29-063 and 29-087, should have read 29-63 and 29:87, re- 
spectively. In preparing the second diagram I became convinced 



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