. Electric railway review . e,representing a yearly saving of 36% cents per horsepower,or 12 per cent interest on $ per engine horsepower in-vested. This would be sufficient to pay the interest on thecost of a pond having square feet per horsepower of theengine capacity. That is, however, more than is generallyrequired and five square feet of surface per pound of steamcondensed is sufficient and there would be little gained byincreasing the investment for a larger pond. If five squarefeet of cooling surface is provided per pound of steam, aplant having horsepower using 15 pounds
. Electric railway review . e,representing a yearly saving of 36% cents per horsepower,or 12 per cent interest on $ per engine horsepower in-vested. This would be sufficient to pay the interest on thecost of a pond having square feet per horsepower of theengine capacity. That is, however, more than is generallyrequired and five square feet of surface per pound of steamcondensed is sufficient and there would be little gained byincreasing the investment for a larger pond. If five squarefeet of cooling surface is provided per pound of steam, aplant having horsepower using 15 pounds of steam perhorsepower per hour would require a pond having an area of75,000 square feet, or one about 312 feet in diameter. There are very few cases of suburban plants where suffi-cient ground for a pond cannot be obtained, though it maybe necessary to locate the pond a considerable distance fromthe plant. The fact that a plant is at a considerable elevation abovethe water supply, whether it is stream or cooling pond, does. Figure 254- (11-16). not prevent installing a condenser plant successfully. Anelevated jet-condenser is admirably suited for such a layoutas shown in Figure 254-(Il-16). This is, in many respects,a more plausible arrangement than to run the exhaust upto the condenser bowl located at a higher elevation. Thesafest arrangement is to have the exhaust drain into thecondenser as shown In Figure 254-(Il-16), but the conditionsare generally such that it cannot be so arranged. The most serious difficulty to be overcome in such in-stallations is the construction of the intake, discharge andcondenser well. This will, however, depend upon the con-dition of the soil and can probably be accomplished by plac-ing the waterway in trenches until the depth becomes ex-cessive and then tunnel the remainder of the distance tothe well. The circulating pump and heater pump would belocated entirely under water and would therefore not require
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