a 
Tornado in N. E. part of Ohio, Feb. 4,1842. 297 
contrary to the sun’s motion; moved towards the northeast. 
Aug. 3, 1839, several sand whirls formed in the road, moved but 
a short distance, yet all revolved in the same direction with the 
sun’s motion. Aug, 4, 1839, another revolved in the same direc- 
tion. May 8, 1840, a whirl revolved in the opposite direction. 
Having satisfied myself that these small whirls revolve indiffer- 
ently with or against the sun, I took no further pains to record 
patticular dates, but have since often observed them revolve in 
each direction. * 
In all the preceding cases, including those of Stow and May- 
field, there are two distinct motions—first the progressive motion 
of the meteor, and secondly its own peculiar motion ; and this 
last may be resolved into three others, viz. a vertical motion, and 
two horizontal, one in the direction of a radius, and the other at 
tight angles to it. These four motions appear to bear a variable 
ratio to each other. The upward and centripetal motions no 
where disappear, yet they are seen in very unequal strength at 
Mayfield and Painesville ; while the motion at right angles to a 
radius is strongly marked at Mayfield, but barely distinguishable at 
Stow. By pursuing the method of investigation exemplified in 
this article, it is believed that the ‘peculiarities of a well marked 
tornado can hardly escape detection. May we not then indulge 
the hope that the much vexed question, whether tornadoes are 
whirlwinds, will soon be Settled ? That some tornadoes are whirl- 
winds certainly cannot be denied. That the motion at right an- 
gles to a radius is sometimes quite small compared with the cen- 
tripetal motion, seems equally clear. That this motion in a tor- 
nado should ever become mathematically nothing, appears infin- 
te ODENSE SE at ee BE IES 
I have collected below, in a tabular form, all the tornadoes in 
this country with respect to which I have been able to obtain 
any important information, and have introduced some of which 
T could only farnish the dates. It is hoped that those who have 
the means will contribute to filling these blanks. ~ 
Vol! xraity No! 222July-Sept. 1842. 
as i ee ee ge * t See ed wet 
