Quote: the tiring effect of heavy labor depends on the percentage of the day under load; heavy pull or push by the arms

Quotation

In comparatively short time, Mr. [Carl G.] Barth had discovered the law governing the tiring effect of heavy labor on a first-class man. ... Practically all such work consists of a heavy pull or a push on the man's arms ... And the law is that for each given pull or push on the man's arms it is possible for the workman to be under load for only a definite percentage of the day.   Google-1   Google-2

Published before 1923

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