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Show TH 3 PRINCIPLE O SCIENTIFI MANAGEMEN the load becomes lighter, the percentage of the day under whic So that, if the workma the man can remain under load increases is handling a half-pig, weighing 46 pounds, he can then be unde load 58 per cent. of the day, and only has to rest during 42 pe cent. As the weight grows lighter the man can remain under during a larger and larger percentage of the day, until finally a load i reached which he can carry in his hands all day long without bein tired out. When that point has been arrived at this law ceases t be useful as a guide to a laborer's endurance, and some other la must be found which indicates the man's capacity for work When a laborer is carrying a piece of pig-iron weighing 92 pound in his hands, it tires him about as much to stand still under the loa as it does to walk with it, since his arm muscles are under the sam sever tensio whethe h is movin o not man however who stands still under a load is exerting no horse-power whatever and this accounts for the fact that no constant reiation could b traced in various kinds of heavy laboring work between the footpounds of energy exerted and the tiring effect of the work on the man It will also be clear that in all work of this kind it is necessary fo the arms of the workman to be completely free from load (that is for the workman to rest) at frequent intervals Throughout th time that the man is under a heavy load the tissues of his arm muscle are in process of degeneration, and frequent periods of rest ar required in order that the blood may have a chance to restore thes tissues to their normal condition To return now to our pig-iron handlers at the Bethlehem Stee Company If Schmidt had been allowed to attack the pile of 4 tons of pig-iron without the guidance or direction of a man wh understood the art, or science, of handling pig-iron, in his desire t earn his high wages he would probably have tired himself out b 11 or 12 o'clock in the day. He would have kept so steadily a work that his muscles would not have had the proper periods o rest absolutely needed for recuperation, and he would have bee completely exhausted early in the day By having a man, however who understood this law, stand over him and direct his work, da after day, until he acquired the habit of resting at proper interval he was able to work at an even gait all day long without undul tiring himself Now one of the very first requirements for a man who is fit t handle pig-iron as a regular occupation is that he shall be so stupi an so phlegmati make-u tha the ox tha he mor nearl any other type resemble Th ma in his menta wh is mentall |