. Handbook of construction plant, its cost and efficiency. Fig. 287. No. 1 Revolving Shovel Excavating Cellars. \ ; R 1 ? . V I j ...ffty ^ jfe Fig. 288. 598 HANDBOOK OF CONSTRUCTION PLANT was also driven by this motor. The swinging machinery wasgeared to a 50 hp. motor, and the thrust motor was also compressor which furnished air to the hoisting drum brake,the emergency brake on the swing motor, and the friction clutchand brake on the intermediate shaft were driven by a 2-hp. con-stant speed induction motor. A test made on October 14, 1912, when the shovel was workingin a gravel ban
. Handbook of construction plant, its cost and efficiency. Fig. 287. No. 1 Revolving Shovel Excavating Cellars. \ ; R 1 ? . V I j ...ffty ^ jfe Fig. 288. 598 HANDBOOK OF CONSTRUCTION PLANT was also driven by this motor. The swinging machinery wasgeared to a 50 hp. motor, and the thrust motor was also compressor which furnished air to the hoisting drum brake,the emergency brake on the swing motor, and the friction clutchand brake on the intermediate shaft were driven by a 2-hp. con-stant speed induction motor. A test made on October 14, 1912, when the shovel was workingin a gravel bank 10 to 12 ft. high, with a clear lift of dipperof 16 ft, loading 6-car trains, gave the following results:. Fig. 289. View Showing Excavator Digging. Total time observed, minutes. Digging and loading occupied 57% of the time. Delays, mov-ing up, etc., occupied 43% of the time. Rate of digging onobserved basis, 1,500 cubic yards of loose gravel in 8 power consumed by shovel in 8 hours, 453 kw. hours = kw. hours per cubic yard of loose gravel. Figs. 285-287 illustrate several makes of shovels in operationon different classes of excavation. DERRICK EXCAVATOR. A recent addition to the large number of excavators is theBishop Derrick Excavator (Figs. 288-289). The properties of this machine furnished by the manufacturerare as follows: o ^-^.S-2 ri c S S 2 3 g ? bo 3 CM ffi •JOS fi 4) ©©©© u fi C-c-0000 0 ° o 5 cS o wseww «l > 5 - 5PS4J :copyright??copyright:© B08 toiaiaiam O m l l l 1 JCQr£ owouaM H cococoeo Mo M F O J1? m:copyright??copyright:• £ 5 t-©-*© PI +-> O p oo©ooeq © in H ..2 (3 NOlflN J ffl b 50 ? rH 5? * Cti ^ <H-dM rHrH^rH CO ojS «*^» +,?2 rtrt C-h §.2^2 n 3 iH
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
