Specification of John Thomas
Subtitle: ventilating and consuming smoke in stoke holes, &c
Publisher: Great Seal Patent Office
Published: 1873
Place of publication: London
Language: eng
Subjects: Smoke prevention; Steam-boilers; Steamboats
Notes: Cover title.

At head of title: A.D. 1872, 30th August. No. 2575.

"John Thomas, of Middlesbrough, in the county of York".