[Electric engineering.] . ed dynamo must be larger, heavier, and more expen-sive for the same output than the belt-driven first cost of the direct-connected machine is, therefore,greater than the belt-driven one. This extra expense is toa certain extent offset by the absence of belting and thedecreased wear and tear on the machinery due to the lowspeed of operation. A great saving in floor space is alsogained by using direct-connected generating sets, and thissaving of space is an important item in large cities, whereground is very expensive. For small plants, where thefirst cost m
[Electric engineering.] . ed dynamo must be larger, heavier, and more expen-sive for the same output than the belt-driven first cost of the direct-connected machine is, therefore,greater than the belt-driven one. This extra expense is toa certain extent offset by the absence of belting and thedecreased wear and tear on the machinery due to the lowspeed of operation. A great saving in floor space is alsogained by using direct-connected generating sets, and thissaving of space is an important item in large cities, whereground is very expensive. For small plants, where thefirst cost must be kept down and where economy of space isnot necessary, belted units are still installed in many cases. § 14 ELECTRIC TRANSMISSION. 11 1-4. Fig. 5 shows the arrangement of a typical moderncentral station designed for a large output. The gener-ators G are of the multipolar type and are driven directlyby the large vertical engines. An electric traveling crane Eruns the whole length of the dynamo room, so that parts of. Fig. 5. the engines or dynamos may be easily handled in caserepairs are necessary. The condenser F is situated in thebasement, and in this case both the air pump and circula-ting pump are driven by electric motors. The boiler roomis situated on the left and is separated from the engine roomby a fireproof wall. The boilers B are of the water-tube 4 - J. III.—2 12 ELECTRIC TRANSMISSION. § 14 type. The hot furnace gases pass through the economizer//on their way to the stack, and thus heat up the feedwaterbefore it enters the boilers. Coal is delivered to the hop-per C by means of the conveyer A, and from C it is fedto the boilers by means of the chute M and the auto-matic stoker g. All the power required for the stokers,coal-handling machinery, etc. is supplied by electric hot water from the condenser is conveyed to a tower K,where it is allowed to fall and come in contact with a cur-rent of air set up by fans. The water is cooled by thismeans, and
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