. Railroad structures and estimates . handle cinders,and in some cases the sand, and is available at odd times forswitching cars. The cost of the locomotive crane set up complete depends onits capacity and may vary from $7000 to $9500 or more. Thecost of storage pit and elevated pockets when desired is also avery variable quantity. In addition a certain amount of specialtrack and yard room has to be figured. A one-ton bucket and 42-ft. boom crane with a 50-ton ele-vated pocket, including the extra track arrangement, wouldaverage $9500. The cost of handling coal by crane depends upon the scheme
. Railroad structures and estimates . handle cinders,and in some cases the sand, and is available at odd times forswitching cars. The cost of the locomotive crane set up complete depends onits capacity and may vary from $7000 to $9500 or more. Thecost of storage pit and elevated pockets when desired is also avery variable quantity. In addition a certain amount of specialtrack and yard room has to be figured. A one-ton bucket and 42-ft. boom crane with a 50-ton ele-vated pocket, including the extra track arrangement, wouldaverage $9500. The cost of handling coal by crane depends upon the schemeof coaling facilities and the work it can do in handling ashes,etc., at odd times. 484 BELT COX\^YOR. Belt Conveyor. (Fig. 229.) — This plant may consist of oneor a series of pockets with an inclined belt on a 25-degree slope,fed from a track hopper beneath the coal car track, the coalbeing delivered to the belt by automatic feeders. A 30-in. w-ide belt, 180 ft. run, with a speed of 100 ft. perminute will deliver 50 tons per Fig. 229. The belt and its supports with a gang walk is usually housedin and supported by trestle, under which the engine room isplaced. The coal pockets are wood construction usually, and a sandshed beneath the coal wharf can be arranged and the sand shotby air to a storage tank at the top of the bin, from which it ispiped to the engines as required. The approximate cost of a wooden structure, single pocket, 500tons capacity plant, including sand house, etc., complete, aver-ages from 812,000 to 818,000. Balanced Bucket or Holman Type. (Fig. 230.) — The ele-vated pocket has a capacity of 350 tons. The coal car is spottedover the hopper and fed by gravity into two vertical cars thatare alternately hoisted and lowered, one going up as the othercomes down. The buckets are automatically fed and dumpedby feed device and tripping arrangements, the buckets beingdesigned to hold three tons and are self-clearing. HOLMAN PLANT. 485 They are operated by hoi
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