. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . rakes. Generally they are self-propelled and are provided withtraveling mechanism installed on the underside of the car-frame and operated from the crane turntable. The turn-table is rotated by a mechanism similar to that used ongeneral service locomotive cranes,- except that in cranesof very heavy capacities, the. rotating gear is very muchmore substantial in construction and differs somewhat indetails of design. The booms u
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . rakes. Generally they are self-propelled and are provided withtraveling mechanism installed on the underside of the car-frame and operated from the crane turntable. The turn-table is rotated by a mechanism similar to that used ongeneral service locomotive cranes,- except that in cranesof very heavy capacities, the. rotating gear is very muchmore substantial in construction and differs somewhat indetails of design. The booms usually are a combination of the web-girderand lattice-truss type of construction and seldom are morethan 35 ft. to 40 ft. in length. These booms generally arecurved near the top but they sometimes are made straightand much longer or are provided with an extension so that,for special work, they may range in length upward to 90ft. or more. The shorter booms are generally used inrailroad wrecking service, for which these cranes are pri-marily designed. They are equipped with a main hoistblock and an auxiliary hoist and for a vertical lift, have 186 HOISTING MACHINERY. CRANES 187
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
