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J. Perelman
"Entertaining physics". Book 2.
Chapter 8. The magnetism. Electricity

MAGNETIC PERPETUUM MOBILE

In the history of attempts to invent a Perpetuum mobile magnet played not the last role. Losers-inventors in various ways tried to use a magnet to arrange the mechanism that forever would move by itself. Here is one of the projects of this "mechanism" (described in the XVII century by the Englishman John Wilkinson, Bishop of Chester).


Imaginary eternal engine.

A strong magnet is placed on the column. It mounted two inclined chute M and N, one after another, with the upper M has a small hole in the top and bottom N bent. If, " said the inventor, on the upper chute to put a small iron ball In, due to the attraction of the magnet And the ball will roll up; however, when he reached the hole, he will fall into the lower chute N, roll it down, runs for curvature D of the gutter and get to the top of the chute M; hence, drawn by a magnet, he will roll up again will fall through the hole, again rolled down and again find himself on the top chute to start moving again. Thus, the ball non-stop will run to and fro, carrying a "perpetual motion".

What's the absurdity of this invention? To indicate it is not difficult. Why the inventor thought that the ball rolled down the chute N to its lower end, will still have a velocity sufficient to lift him up the curving D? So if the ball rolled under the action of only one gravity: then he slid least rapidly. But our ball is under the action of two forces: gravity and magnetic attraction. The last assumption is so much that can cause the ball to rise from the position In the up With. Therefore, the chute N , the ball will roll down not rapidly, but slowly, and even if you reach the bottom end, at least not accumulate speed needed to lift the curve D.

The project described many times again pop up later in various modifications. One of such projects was even, oddly enough, patentowy in Germany in 1878, i.e., thirty years after the proclamation of the law of conservation of energy! The inventor of the so-masked ridiculous the main idea of your "perpetual magnetic motor"that misled the technical Commission issuing patents. And although, according to the Statute, patents for inventions, the idea which is contrary to the laws of nature, should not be granted, the invention of this time was formally patented. Probably the happy owner of this unique patent soon became disillusioned with his offspring, because in two years ceased to pay the fee, and a curious patent has lost legal force; "invention" became public domain. However, it's useless.

Entertaining physics J. Perelman

 




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