allows per minute; the auxiliary is a motor of the gearing and operating mechanism similar type, of 60 kilowatts capacity, and to be entirely inclosed in a water-tight a speed per minute of 475 revolutions. steel casing. This type of pump works The smaller motor is usually employed as readily… … operator is one for which AN ELECTRIC AUGUR DRILL IN THE MINE OF THE LOOKOUT COAL there can exist no active CO., WYOMING, PA. competition. While the electric hoist vibrates, its gear with the main hoist-motor when a heavier load than usual is to be handled. regular rotary motion cannot be com- The…
Engineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
