A System of Natural Philosophy in Which Are Explained the Principles of Mechani

Cover A System of Natural Philosophy in Which Are Explained the Principles of Mechani
A System of Natural Philosophy in Which Are Explained the Principles of Mechani
J L John Lee Comstock
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Suppose the FIG. In. Extremity 1, Fig. Ill, to be presented up- ward, as. In the figure, the screw itself being inclined as represent- ed. Then, from its peculiar form and po- sition, it is evident, that commencing at 1, the screw will de- scend until we arrive at a certain point, 2 ; in proceeding from 2 to 3, it will ascend. Thus, 2 is a point so situated that the parts of the screw on both sides of it ascend, and therefore if any body, as a ball, were placed in the tube at 2, it could not mo...ve in either direc- tion without ascending. Again, the point 3 is so situated, that the tube on each side of it descends ; and as we proceed we find another point, 4, which, like 2, is so placed, that the tube on both sides of it ascends, and, therefore, a body placed at 4, could not move without ascending. In like manner, there is a series of other points along the tube, from which it either de- scends or ascends, as is obvious by inspection.
Now let us suppose a ball, less in size than the bore of the tube, so as to move freely in it, to be dropped in at 1.


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