Show NEVER NEEDS TO BE WOUND this clock runs until metal parts that constitute its ita works are arc worn out clocks that tell the time with only one ona hand are something of at a novelty but they cannot compare with a recently invented Invent Pd clock which never needa needs winding it will run forever or at least until its metal parts parta wear out this sounds like the old fallacy of 0 perpetual motion but as a matter ot of fact la Is far from it the new clock runs by using in an ingenious way the energy produced by changes la in temperature pera ture metal bars which are very sensitive to temperature changes are arranged in such a manner that when the mercury falls and the bars contract this thin slight motion of the metal la is fully usel used when the thermometer goes up and the bars expand slightly the motion involved in their lengthening Is also made to do work the motion from tho the bars lifts tiny steel balls from a lower reservoir to an upper one there they are made to turn a wheel in much the same way that water turns an old fashioned water wheel the energy resulting from the expansion and contraction of metal na as the temper autre changes can be used only to operate mechanism like that of clocks and watches which requires only a small email amount of power it la id too expensive to bo be used where much power Is required somebody with a fondness tor for mathematics haff estimated that to generate a single horse power in this way would cost nearly fifty million dollars |