in, - 
{From the Pilot Chart of the North 
Atlantic Ocean, July, 1890. ] 
HATTERAS HURRIOANE 
THE ST, THOMAS- } 
OF SEPT., 1889. 
HUBRIOANE OF } Noon, 
THE OUBAN ' SEPT. 5, 
SEPT., 1888, ) G. M. T. 
ey: 
HURRICANES IN THE NORTH ATLANTIU.—TYPICAL CIRCULATION OF THE WIND, FROM ACTUAL OBSERVATION. 
vations in order to illustrate the actual circulation of the wind in hurricanes, : y 
The above diagrams Rayejbeen prepared to Pie eater Wein a Paka last month gave all the observations upon which the spiral lines were based for that particular 
during Bic) preset ur ricatte caso panels thi ae Beek followed here, only the observations themselves are omitted, for the sake of clearness, Perhaps the most important port @ 
hurricane (Nov. 25, 1888), and the ae award spiral curve, and not circularly, except very near the center. The center therefore gencrally pers more than pend) points ou e mig aad 
notice is that the surface wind blows in an inv th fat that although the 8-point rule is nearly true when the wind is anywhere from North to oe yay of Lek ie is, g ne wy 
the wind. Another MEHY pasoaag or “able to be a very poor guide when the wind is from any point in the first or pea quam aie = owe ont re foe a ane Sith 
speaking, in the navigable semicircle A 1s SE.; with the wind East it may bear from SW. to South ; and with the wind SE. it may a SW., Wes 4 eleven ( tt oP SUNN 
center may bear anywhere from Sout! to Fate rs about eight points to the right of the direction from which the low clouds come, or, what i Prestice y e same ing, ight p niet 
rere the best general rule = oe ep apaiee shift in a heavy squall; after such a shift the wind will remain steady in direction for a time, but the center is meanw i I 
e at the momen h ¢ a : : ’ | ; 
and the er le itv changes until]. the mere chil, when. 1t goes sae eae Lean eat the two.days selected for illustration: had i been moving faster, the in-deenel (Gs 
AMM eo areiatess tr tidita moilitrenatts CNet Lowest hat less in advance and considerably greater in rear than what is in icated. t is exceptional also to find a 
era Feo Oe eee ination ae a Soe ne oe on Sept. 10th ; it died out altogether in a few days, Boch of eae pater oe eae usualy he 
a T a eae ea ci “aotion is about W. by N., and this, together with the steady increase in size, is well illustrated in the g 
case. In the tropies the us' progressive : or: GFinencum, : s : 
y moe, however, oe peo Sate DEIR oA Resa tees cibas ter thie Of during the hurricane pone oven if only position, wind, weather, and barometer, at nbon, 
G. i ae Aedioanenar often adds-greatly to the completeness of the data used ih preparing these diagrams. 
~M. T., , 
as a practical guide for navigators 
