Filter-works in Holland. Gives sand, gravel, and water thickness, with diagrams.
—— Journal für Gas- und Wasserversorgung, 1892, p. 686.
Description of filters built by the author at Leeuwarden, Holland, with plans.
Hart. Proceedings Inst. of Civil Engineers, 1890, c. p. 217.
Description of filters at Shanghai.
Hausen. Journal für Gas- und Wasserversorgung, 1892, p. 332.
An account of experiments made for one year with three 16-inch filters at Helsingfors, Finland, with weekly analyses of effluents.
Hazen. Report of Mass. State Board of Health, 1891, p. 601.
Experiments upon the filtration of water.
—— Report of Mass. State Board of Health, 1892, p. 539.