Specification of William Heap, Demus Sharp, and George Knowles
Subtitle: furnaces
Contributors: Sharp, Demus; Knowles, George
Publisher: Great Seal Patent Office
Published: 1857
Place of publication: London
Language: eng
Subjects: Smoke prevention; Furnaces; Boilers
Notes: Cover title.

At head of title: A.D. 1856. No. 1954.

"William Heap, Demus Sharp, and George Knowles all of Bradford, in the county of York, engine turners".