Specification of David Walker
Subtitle: preventing smoke in furnaces
Publisher: Great Seal Patent Office; George E. Eyre and William Spottiswoode)
Published: 1870
Place of publication: London
Language: eng
Subjects: Smoke prevention; Furnaces
Notes: Cover title.

At head of title: A.D. 1870, 6th May. No. 1299.

"David Walker, of Leith, in the county of Mid Lothian, North Britain, engineer".