O. N. Stoddard on the Brandon Tornado. 77 
loop of either section could be supplied by interpolation from the 
The barred arrows on the left of the loop in Section JI desig- 
nate trees which, though lying side by side with those on the 
Opposite part of the same loop, yet rested with their limbs above 
the latter. The barred arrow in Section If which lies at the in- 
tersection of the curve was resting upon six large trees. An in- 
volute converging rapidly towards the centre might answer toler- 
ably well the conditions of Section I, but it fails entirely when 
applied to Section IIL. 
The involute action does not seem to have been distinctly 
marked. While. passing rapidly over another part of the track, 
the bearings of scattering trees which were taken afforded more 
significant indications of the involute form near the axis. The 
telative distances in the latter case were not noted with sufficient 
accuracy to justify a projection. 
The data thus far given are believed to be sufficient to enable 
the reader to form an intelligent opinion of the mode of action of 
this tornado. A few additional observations may afford some 
urther aid. 
Ist. The space between the dotted line and the right hand 
border of the storm includes the path of most destructive violence. 
Within this limit almost every tree was prostrated or broken. 
This limit was clearly defined, especially on the left where the 
tornado first encountered the forest ; but after plunging into it for 
some distance, its action became more obscure, and less sym- 
metrical, 
2d. On the left of the dotted line the force was much less vio- 
lent, but trees enough were prostrated to determine the direction 
of the wind, 
No case was found of an object on the right thrown in- 
Ward more than 11° or 12°, The mass of the trees on the right 
border lay parallel with the course of the storm. : 
Ath, Along the dotted line, the trees generally lay N. 23° W.; 
Making an angle of 794° with the general course of the storm. 
ery few cases were observed of objects in the centre 
thrown forward in the direction of the path. 
. th. There was no distinct case of the outward explosive ac- 
hon in buildings. The ascending current was, notwithstanding, 
oo Violent, for large objects were raised and transported several 
les, 
7th. Persons just outside of the path describe the storm asa 
column of Vapor or smoke, whirling in indescribable confusion, 
accompanied with a deafening roar, so that the thunder, if any, 
Was Uundistinguishable amid the general din and confusion. 
8th. The atmosphere on the borders of the track appeared to 
Suffer but little disturbance from the passage of the storm; and 
nO current could be observed setting in towards it. 
