Specification of William Parsons
Subtitle: separating the solid matter from sewage waters
Publisher: Great Seal Patent Office
Published: 1859
Place of publication: London
Language: eng
Subjects: Sewage; Manures; Filters and filtration; Sewerage
Notes: Cover title.

At head of title: A.D. 1858, 23rd July. No. 1664.

"William Parsons, of Pratt Street, Old Lambeth, manufacturing engineer".