Greater Indianapolis ;the history, the industries, the institutions, and the people of a city of homes . ars. The solution of the problem is the con-struction of a few dams and locks, and thedeepening of the. channel at ])oints by the re-moval of sand and gravel. It is a singular fact that more real progresstowards making the river iiractically naviga-Ide has been made in the last ten years thanever before, and Withmit any intention of years people have been taking sand andgravel from the bars for various , but in18i)7 was begun the business of pumping themfrom the bottom of the st
Greater Indianapolis ;the history, the industries, the institutions, and the people of a city of homes . ars. The solution of the problem is the con-struction of a few dams and locks, and thedeepening of the. channel at ])oints by the re-moval of sand and gravel. It is a singular fact that more real progresstowards making the river iiractically naviga-Ide has been made in the last ten years thanever before, and Withmit any intention of years people have been taking sand andgravel from the bars for various , but in18i)7 was begun the business of pumping themfrom the bottom of the stream, where theycould not be reached by the old process ofshovel and wagon. Tliis business has devel-oped until now there arc si.\ steam pumpsworking on the river at Indianapolis, and sev-eral at otlur )ioints. These jiumps arc set onscow boats, averaging from 50 to Go feet in ? Septend)ir ;!0. ISIS. (1(1/ lii-jils. Tinnnl <i{ Worh<. 1S! first ((iiirciil ion /mliiniiiIliinrh iif Lirrrx mid llarliors CoiKjresg, p. 104. iiisToKV OF (;i;k.\ii:i! 21. Q 5 ffil < o o c E- a o <: 22 HISTORY OP GREATER INDIANAPOLIS. length and --O to 25 in width, and by centrif-ugal suction power draw up a mixture ofwater, sand and gravel through 8-inch pipe entrance is protected from tlie admis-sion of stones over four or five inches in diame-ter, to avoid clogging. The stream passes outover screens that separate the material into twogrades of sand and two of gravel. The prod-uct is used for plastering, locomotive sand,concrete work, asphalt mixture, rooting andstreet improvement. Formerly Lake Michigansand used to be shipped here in considerableamount, but now its place is filled by this prod-uct. The capacity of a pump is about loOcubic yards a day, and the actual productabout 30,000 yards in a working year. Inotlier words these six pumps now at Indian-apolis are taking about 180,000 cubic yards ofobstruction out of the river annuall
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