aqueduct descends 115 the construction feet on a grade of 10 percent. From the bottom of this incline to the bank of the Harlem, the usual grade of this machine are in the im- of 7-10 of a foot to the mile is maintained. proved cylindric- We now reach the most interesting point on the aque- al… … steam. It is be- INGERSOLL BOILER HOUSE AND ENGINE ROOM. eause of these points, which we dam to the one at 135th St. is now under way, the total have only men- contract price, including the two gate houses, being tioned, that the $14,000,000. Theestimated cost of Quaker Bridge dam Ingersoll com- is…
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