Transactions . -generator set having an 1100-hp. motor and a generatorcapacity of 1000 kw. with voltage of 0 to 600. This set will run at The flywheel weighs 33,000 lb. (14,949 kg.). The air-shaft hoistwill be operated by a geared alternating-current motor. Tipples The construction of the tipples shows only one striking novelty, theconcrete air-shaft tipple of the Kathleen mine, shown in Fig. 3. Theuse of concrete for the construction of tipples is not in itself a novelty, asit has been used in some other districts. In this case concrete was C. A. HERBERT AND C. M. YOUNG 821 adopted,
Transactions . -generator set having an 1100-hp. motor and a generatorcapacity of 1000 kw. with voltage of 0 to 600. This set will run at The flywheel weighs 33,000 lb. (14,949 kg.). The air-shaft hoistwill be operated by a geared alternating-current motor. Tipples The construction of the tipples shows only one striking novelty, theconcrete air-shaft tipple of the Kathleen mine, shown in Fig. 3. Theuse of concrete for the construction of tipples is not in itself a novelty, asit has been used in some other districts. In this case concrete was C. A. HERBERT AND C. M. YOUNG 821 adopted, not because a concrete structure was desired, but because at thetime of designing it was doubtful whether steel could be obtained. Inspite of the fact that a portion of the concrete was poured when the ther-mometer registered about 20° below zero, the work is sound and thestructure is peculiarly attractive. Moreover, it is perfectly rigid, novibration whatever being felt when the hoist is running. The cost of. Fig. 3.—Concrete tipple at air shaft, Kathleen mine. the concrete tipple, as built, was about $6000 higher than the cost ofthe steel tipple originally intended. A considerable part of this excesswas due to the expense of heating the materials and of pouring the con-crete during severely cold weather. At this mine and at the Valier, carshoisted at the air-shaft will be dumped into Wood single-car rotarydumps. The main-shaft tipple of Superior No. 4 mine is shown in Fig. may also be drawn to the fact that of the mines mentioned,four have tipples of the three-leg type introduced by Allen & Gracia. 822 ENGINEERING FEATURES OF MODERN LARGE COAL MINES Two of these have bar screens, and the other shaking screens. Thetipple at the Bell & Zoller No. 2 was designed and built by the WisconsinBridge & Iron Co. The tipple at the Standard No. 2 mine was designedby R. W. Hunt & Co.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
