Selbstthätige Wasseraustrittsregler besonders für Filter. A description of the automatic regulating device for filters used at Bremen.
—— Zeitschrift des Vereines deutscher Ingenieure, XXX.
Reinigung des Trinkwassers in Bremen durch mehrmalige Sandfiltration. A description of the method of double filtration used at Bremen, giving results obtained in full. No drawings.
Grahn. Journal für Gasbeleuchtung und Wasserversorgung, 1895.
Water purification plant at the city of Magdeburg. A description of the old plant, and the changes which have been made in it to increase its capacity, and make it conform to the requirements of the German official instructions regarding filtration. Many illustrations and plans.
Halbertsma. Journal für Gasbeleuchtung und Wasserversorgung, 1896.
Die Resultate der doppelten Filtration zu Schiedam. A description of double filtration at Schiedam, with the bacterial results for the two years, 1894 and 1895, showing an average bacterial efficiency of 99.76 per cent.
Hazen. Report to Filtration Commission, Pittsburgh. City document, 1899.
A description of experiments upon the treatment of the Allegheny River water by sand and mechanical filters.
—— Ohio State Board of Health Report, 1897, p. 154.