. Electric railway review . times theweight of a columnof water as high asthe length of theram. Two guidesfor the platform aregenerally fitted atdiagonally oppositecomers of the ele-vator shaft. Thesealso are necessaryFigure 320 (0 1-5). Figure 319 (O 1-4). if ^ turntable is used on the elevator i)latform. For small power houses thistype of the elevator is in many ways better than a high-speedelectric elevator, being less easily damaged by careless han-dling and less liable to accident. If the lift were 16 feet orover it would be quite an undertaking to sink the casingplumb for such a distance
. Electric railway review . times theweight of a columnof water as high asthe length of theram. Two guidesfor the platform aregenerally fitted atdiagonally oppositecomers of the ele-vator shaft. Thesealso are necessaryFigure 320 (0 1-5). Figure 319 (O 1-4). if ^ turntable is used on the elevator i)latform. For small power houses thistype of the elevator is in many ways better than a high-speedelectric elevator, being less easily damaged by careless han-dling and less liable to accident. If the lift were 16 feet orover it would be quite an undertaking to sink the casingplumb for such a distance and in such cases an outsidecylinder with overhead sheaves and cable would be simplerto install and would be somewhat less expensive. Such a lift is shown in Figure 319 (0 1-4). the hydraulicram in this case having one-half the travel of the elevator plat-form. A sufficient counterweight must be loaded on the ramto permit it to discharge the water and raise the platformwhen loaded. This construction is quite similar to the. standard high-lift elevator construction. For high lifts anelectrically operated elevator may be found more economicallo operate. It is only for a low lift that the type of elevator shown inFigure 318 is ))articularly adapted in power station work. Anoperating valve and operating cable are shown in Figure320 (0 1-5). Automatic stops (top and bottom limits) areclamped to the operating cable, which, being struck by an armextending from the platform, automatically shut off the waterand stop the elevator at the upper and lower levels. The pipe for such an installation should be car-ried above ground, but the waste pipe may be run under-ground, especially if it discharges into a sewer. Unfortunatelythe location of the operating valve is generally such that itprecludes the possibility of using pipe bends instead of elbows,but if it were possible to use them, the hoist would operatemore quickly without requiring any greater power from thepump. Class P 1
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
