A description of the new Rotterdam filters, with full drawings.
Veitmeyer. Verhandlungen d. polyt. Gesell. zu Berlin, April, 1880.
Filtration and purification of water.
Wolffhügel. Arbeiten aus dem Kaiserliche Gesundheitsamt, 1886, p. 1.
Examinations of Berlin water for 1884-5, with remarks showing superior bacterial efficiency with open filters.
—— Journal für Gas- u. Wasserversorgung, 1890, p. 516.
On the bacterial efficiency of the Berlin filters, with diagrams.
Zobel. Zeitschrift des Vereins deutsche Ingenieure, 1884, p. 537.
Description of filters at Stuttgart.
OTHER LITERATURE.