Specification of Henry Malcolm Ramsay
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1874
Place of publication: London
Language: eng
Subjects: Sewage; Filters and filtration; Sewage disposal; Sewerage
Notes: Cover title.

At head of title: A.D. 1873, 12th December. No. 4092.

"Henry Malcolm Ramsay, of 11, Amyand Park Road, Twickenham, in the county of Middlesex, civil engineer".