Specification of Ralph Idle and George Naylor
Subtitle: consuming smoke
Contributors: Naylor, George
Publisher: Great Seal Patent Office
Published: 1870
Place of publication: London
Language: eng
Subjects: Smoke prevention; Boilers
Notes: Cover title.

At head of title: A.D. 1869, 17th December. No.3653.

"Ralph Idle and George Naylor, both of Earls Heaton, near Dewsbury, in the county of York."