. Transactions. Fig. 2.—Position when startixpenetrate the mass. all readings, and entered them on special record sheets and charts in aconvenient manner for comparison and study. During the period of preliminary work, it was discovered that the. Fig. 4.—Position just prior tolifting mass. Fig. 5.—Mass has reen lifted. work of a shoveler can be classified into the following divisions, eachsusceptible to comprehensive study and analysis, and to each of whichcan be given a definite relative time value: Time spent actually shoveling, which may be divided into: Penetrat-ing mass, lifting mass, thr
. Transactions. Fig. 2.—Position when startixpenetrate the mass. all readings, and entered them on special record sheets and charts in aconvenient manner for comparison and study. During the period of preliminary work, it was discovered that the. Fig. 4.—Position just prior tolifting mass. Fig. 5.—Mass has reen lifted. work of a shoveler can be classified into the following divisions, eachsusceptible to comprehensive study and analysis, and to each of whichcan be given a definite relative time value: Time spent actually shoveling, which may be divided into: Penetrat-ing mass, lifting mass, throwing mass, and return to start of first motion. G. TOWNSEND HARLEY 153 Time spent picking down, considered as a and dumping time, with wheelbarrow or spent resting, divided into: Definite rest periods and delaysdue to interferences, blasting, men and supplies passing, etc. •% A ^-,v-, • J*V fc*1 n*^^Bt^BBBBBH(i 7r**>^: -^n:__:^_ Fig. 6.—Preparing to throw short step has been taken in direc-tion of throw.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
