Specification of Ralph Howarth
Subtitle: furnaces for steam boilers
Publisher: Great Seal Patent Office
Published: 1854
Place of publication: London
Language: eng
Subjects: Smoke prevention; Steam-boilers; Furnaces
Notes: Cover title.

At head of title: A.D. 1858, 28th July. No.1700.

"Ralph Howarth, of the firm of Howarth and Cryer, Slater Field Foundry, Bolton-le-Moors, in the county of Lancaster, millwrights and engineers."