280 British Association for the Advancement of Science. 
ing, may be ascertained ; if the 
ship be then so manceuvred as 
that the wind shall veer aft in- 
stead of ahead, and the vessel is 
made to come up, instead of be- 
ing allowed to break off, she will 
run out of the storm altogether ; 
but, if the contrary course be 
taken, either through chance or 
ignorance, she goes right into 
the whirl, and runs a great risk of being suddenly taken aback, 
but most assuredly will meet the opposite wind in passing out 
through the whirl. To accomplish her object, he showed, by 
a diagram,* (as is above represented,) that it was necessary 
the ship should be “laid on opposite tacks, on opposite sides of 
a storm, as may be understood by drawing a number of con- 
centric circles to represent the whirl of the hurricane, and then 
different lines across these, to represent the course of ships enter- 
ing into, or going through the storm ; but to attempt the full ex- 
planation of even this, would execitd much beyond our limits. 
‘The apparent pects of the force of storms with the law 
of magnetic intensity, as exhibited by Major Sabine’s report, is 
remarkable. It had beat frequently remarked that no storms 
occur at St. Helena. He had therefore felt. much curiosity to 
know the degree of. oes intensity there, and was not a little 
‘Struck at finding it the est yet ascertained on the globe. 
Major Sabine’s Isodynamic lines, to express less than unity, are 
only marked there, ‘and they appear as it were to mark the true 
Pacific Ocean of the world. The lines of greatest intensity, on 
the contrary, seem to correspond with the localities of typhoons 
and hurricanes ; for we find the meridian of the American mag- 
netic pole paibeinig not far from the Caribbean st and that of the 
Siberian pole through the China sea. — - 
_ Prof. A. D. Bache, of Philadelphia, stated that he rose to than 
Col. Reid, for the very handsome marmer in which: he had 
brought forward the cui of his countryman, Mr. Redfield. 
ee 
. A Bape similar = ; 
with a discussion of the methods of escaping a storm, Was res by Mr. 
Vol. xxxt, p. 117, of this Journal—Eps. 
is, wee in some respects more full ‘od explicit, together 
Redfield i 
