. The American journal of science and arts . 70-75.] At the front of the house a, however, were two slatted door-yard fences, extending from the house to the road. The fence ewas overthrown northward toward /, and the fence/in the con-trary direction towards e: both directions being transverse to theline of the axis, which passes between them. Such cases havebeen adduced as supporting a directly inward course of the windin the body of the tornado; or, as indicating two bodies of oppo-sing wind meeting on a central line; but I draw a different con-clusion. Let Fig. II represent, Fig. Ii. horizo
. The American journal of science and arts . 70-75.] At the front of the house a, however, were two slatted door-yard fences, extending from the house to the road. The fence ewas overthrown northward toward /, and the fence/in the con-trary direction towards e: both directions being transverse to theline of the axis, which passes between them. Such cases havebeen adduced as supporting a directly inward course of the windin the body of the tornado; or, as indicating two bodies of oppo-sing wind meeting on a central line; but I draw a different con-clusion. Let Fig. II represent, Fig. Ii. horizontally, the direc-tions of such centerblowing winds in thebody of the tornado,and let it be supposedas passing over the areaof Fig. I, without re-volving, so as the courseof the center will coin-cide with the arrowwhich indicates thecourse of the axis onthat figure. It may thus be seen that on this hypothesis thewind must strike the fences e, /, either parallel to their length,or but little oblique; a direction of wind which seldom or never. ...V,- 268 Rotary Action of the Providence Tornado. prostrates fences, even in the path of a tornado. Besides, nearthe center of such an inward blowing tornado, where only itcould act on these fences with lateral force, such winds must ne-cessarily become neutralized both by blowing against each otherand by turning upward to escape, thus having little effect at thispoint, within four feet of the ground. I say nothing here of thepossibility of any winds blowing with violence in such centraldirections; which I could never conceive : For the entire spacesbetween the centripetal lines of arrows must be conceived as be-ing filled by the affluent winds; the lines only indicating theirdirections. But on the other hand, let us suppose a strong whirlwind pass-ing in the same direction: the front half of which, both on andnear the line pursued by its axis, must necessarily sweep laterallyacross this line, first northwardly towards /, if it be revolvi
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