Betterment briefs : a collection of published papers on organized industrial efficiency (1909)
Jacobs, Henry William, 1874- · New York : John Wiley · leaf 109
FIG. 56—OLD METHOD OF MILLING PORTS OF PISTON-VALVE BUSHINGS. BUSHING WAS SET BY HAND AND ONE PORT BEING MILLED AT A TIME. THE 98 Betterment Briefs. … FIG. 57—IMPROVED METHOD OF MILLING PORTS OF PISTON-VALVE BUSHINGS.THE MACHINE IS EQUIPPED WITH FOUR MILLING CUTTERS AND THE BUSHING IS MOUNTED ON A MANDREL THAT CAN BE ROTATED BY A HANDLE.
Railroads -- Equipment and supplies · Locomotives -- Maintenance and repair · Railroads -- Repair-shops
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