Pickering Creek, Pa. | | 234 | W. G. Overbrook, Penna. | | 78 | W. G. Vandergrift, Pa. | | 156 | W. G. Frazerville, P. Q.[62] | | 78 | N. Y. G. Arnate, Pa. | | 50 | N. Y. G. Chihuahua, Mex.[62] | | 612 | J. G. West Reading, Pa. | 0.07 | | W. G. +------------+--------+ Totals | 108 |77,806 | --------------------------+------------+--------+--------------------- Special filters, neither sand nor mechanical: Wilmington, Del.; Pop., 61,431; area, 10,000 sq. ft.; nominal capacity, 10 million gallons. See Eng. News, Vol. 40, p. 146. NOTES REGARDING SAND FILTERS IN THE UNITED STATES. POUGHKEEPSIE, N. Y. Designed by James P. Kirkwood, built in 1872, was the earliest of its kind in the United States. It was enlarged by the Superintendent, Charles E. Fowler, in 1896. The walls of the original filters were of rubble, and in course of time developed cracks and leaked badly. The walls of the new filter are of rubble, faced with vitrified brick. The filters treat the water of the Hudson River, which is sewage-polluted and more or less muddy. Description: Jour. N. E. Water Works Assoc., Vol. 12, p. 209. HUDSON, N. Y. Designed by James P. Kirkwood, built in 1874. enlarged in 1888. The filters are open and are used for treating the Hudson River water, which is sewage-polluted and more or less muddy. Description: Eng. News, Vol. 31, p. 487. ST. JOHNSBURY, VT. (E. & T. Fairbanks & Co.) These filters were built about 30 years ago, and have been recently enlarged. The filters were originally open, but were afterwards covered with a roof. The single roof proved inadequate to keep them from freezing, and a second roof was added inside and under the main roof. They are used for filtering pond water, which is quite clear and not subject to much pollution. The water supply is one of two, the other is the town supply and is taken from the Passumpsic River. No published description. NANTUCKET, MASS. Designed by J. B. Rider, built in 1892. This filter is used to remove organisms from the reservoir water supply. It is only used when the organisms are troublesome, and is satisfactory in preventing the tastes and odors which formerly resulted from their presence. Description: Jour. N. E. Water Works Assoc., Vol. 8, p. 171; Eng. News, Vol. 31, p. 336. LAWRENCE, MASS. Designed by Hiram F. Mills, built in 1892-3, and put in operation September, 1893. It is used for treating the water of the Merrimac River, which contains a large amount of sewage. Description: Report of the Mass. State Board of Health, 1893, p. 543; Jour. N. E. Water Works Assoc., Vol. 9, p. 44; Eng. News, Vol. 30, p. 97.