d of an upright bar node, and remains still; but the two free halves elongate of metal ;on the top of this bar rests a little brass stem, §, the and contract in rapid alternation. I apply the rubber more top of which acts as a fulcrum to the plate of agate, A. The briskly, and the balls a and } are… … iliar example of the way this contractile force is utilized. bly reach the roots of natural phenomena without the help In this case the amplitude of the vibration is so small that Thus we make ourselves acquainted with the sensible fact of atoms and molecules. We figure them as the constitu- no eye…
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