. Building and repairing railways . Fig. 49. VIEW SHOWING THE METHOD OF DUMPING AROTARY DUMP CAR. excavated and loaded into the cars by picks andshovels or steam shovels, according to the extentof the cut (see Figs. 51 and 54). Where looserock is encountered the work is conducted inmuch the same manner as earth. Hard pan is acemented gravel, and is found in all stages ofhardness from earth to solid rock; however, thelatter occurs but seldom. It occurs sometimesin mass and again in veins from a few inches toseveral feet thick; as generally found it can bebroken up with a specially designed plow
. Building and repairing railways . Fig. 49. VIEW SHOWING THE METHOD OF DUMPING AROTARY DUMP CAR. excavated and loaded into the cars by picks andshovels or steam shovels, according to the extentof the cut (see Figs. 51 and 54). Where looserock is encountered the work is conducted inmuch the same manner as earth. Hard pan is acemented gravel, and is found in all stages ofhardness from earth to solid rock; however, thelatter occurs but seldom. It occurs sometimesin mass and again in veins from a few inches toseveral feet thick; as generally found it can bebroken up with a specially designed plow (see CONSTRUCTION. 109. 110 BUILDING AND REPAIRING RAILWAYS. Fig. 55). If it is extremely hard, it is oftenblasted by explosives, but it does not break up
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
