Specification of Joseph Exley and John Ogden
Subtitle: furnaces
Contributors: Ogden, John
Publisher: Great Seal Patent Office
Published: 1857
Place of publication: London
Language: eng
Subjects: Smoke prevention; Furnaces
Notes: Cover title.

At head of title: A.D. 1857. No. 1770.

"Joseph Exley, of Leeds, in the county of York, engineer, and John Ogden of the same place, engineer".