. Railway mechanical engineer . n. sill dresser Cutting one side oak. 2-i by 8-in. to l?^-in by 8-in. Timber sizer Cutting four sides Double surfacer IJi-in. by 10-in. oak Hollow chisel 2-in. chisel, 4-in. deep Wood turning lathe .. 5-in. diameter piece Band saw Sin Cutting 10-in. oak 16-in. rip saw Cutting 3-in. oak 16-in- cut-off saw .. Cutting n4-in. oak From the records of the individual machines a summarywas made as shown in Table II. SUMMARY OF TESTS AND COSTS OF MOTOR D
. Railway mechanical engineer . n. sill dresser Cutting one side oak. 2-i by 8-in. to l?^-in by 8-in. Timber sizer Cutting four sides Double surfacer IJi-in. by 10-in. oak Hollow chisel 2-in. chisel, 4-in. deep Wood turning lathe .. 5-in. diameter piece Band saw Sin Cutting 10-in. oak 16-in. rip saw Cutting 3-in. oak 16-in- cut-off saw .. Cutting n4-in. oak From the records of the individual machines a summarywas made as shown in Table II. SUMMARY OF TESTS AND COSTS OF MOTOR DRIVE. In the machine shop the net average power rer|uired while the average gross load. Assuming 85 per cent efficiency forthe individual motor drive, an average of only 293 hp. wouldbe required for the machine shop and planing mill, a savingof 78 hp., or per cent. From the data given above the investment required tochange the machines to individual motor drive was cal- TerrTTTfals i @ r^ £jIfiUj-T ^^ + 1 £PS 7. U^trSf,,. -^ I DPD7. y Fig. 6—Wiring Diagram of the Portable Electric Meter Table culated. To this amount was added that portion of theoriginal cost of the present equipment, less its scrap value,which had not already been provided for in the sinking fixed charges on this amount were added to the oper-ating costs for the individual motor drive, and this com-pared with similar figures for the present equipment. Thecalculated saving in yearly expense after all charges hadbeen met and the costs per horsepower under the presentand the proposed system had been considered amounted to14 per cent on the It will be seen from this thata considerable saving is effected by the adoption of the in-dividual motor drive in this case, aside from that resultingfrom better lighting and the greater reliability and increasedoutput of the machines. Developments in Railway Shop Tools A Brief Survey of the More Important Improve-ments Introduced Within the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
