Date: November 15, 1887
Creator: Waespi, Jacob; Fretz, Emil; Spellman, John & Frey, John
Description: Patent for a new and improved filter. This design "consist[s] of the receptacle having the receiving, settling, and filtering chambers, in the bottom of which filtering chamber are formed transverse wedge-shaped ridges, and at the bottoms of the settling, receiving, and filtering chambers and of the basin are arranged outlet pipes, which receiving, settling, and filtering chambers are separated from one another by walls or partitions of successively varying or lesser heights, and which basin is arranged lower than the filtering chamber, together with a branched supply pipe" (lines 16-27).
Contributing Partner: UNT Libraries Government Documents Department