Vortical Rotation of the Gale. 17 
that the correction is required; and have accordingly applied it, 
in tracing the transverse curve: but have drawn a short trace 
line to show the observations as found in the report. 
I have also inserted in this diagram, in broken lines, the trans- 
verse barometric curve through the center of the Cuba hurricane 
of October, 1844; when in nearly the same geographical position. 
This curve is approximated from twenty-eight observations in 
the path of that storm. 
Barometric Storm-Curves, transverse to the Progression. 





]. Transverse centre-curve of Cape Verde and Hatteras hurricane, Sept. 7, 1853. 
2. Transverse center-curve of Cuba hurricane of 1844, Oct. 6th. 
Vortican Rorarion or THE GaLE.—The true character of this 
gale as a cyclone, is made evident by the foregoing series of ob- 
Servations. 'This is most extensively shown by the various ob- 
Servations made on all sides of the storm during its passage 
tween Bermuda and the nearer portions of the United Staies. 
the barometer, in the interior portions of the gale, are e man- 
ifest by direct observation. This I might point out in full detail, 
Were it at all necessary in the present stage of the inquiry. Nor 
can these results be evaded by denominating any one portion of 
the cyclonic wind, on either side of the cyclone, as another or 
distinct gale. The local variations and inequalities of the cy- 
clonic action and the errors, imperfections or defects which may 
exist in the reports, are alike overborne by the amount of evidence 
3 
Skconp Serses, Vol, XVIII, No. 52—July, 1854. 
