Smelting iron ores.
Contributors: Great Britain. Commissioners of Patents.
Series: Patent / Great Britain. Commissioners of Patents. 1871 -- no.1959; Patent (Great Britain. Commissioners of Patents) -- no.1959.
Publisher: published at the Great Seal Patent Office...
Published: 1872
Place of publication: London
Language: eng
Subjects: Blast furnaces -- Patents.; Iron industry and trade -- Patents.
Genres: Patents.
Notes: Letters patent, A.D. 1871, no.1959.

At head of title: Specification of Charles William Siemens.

Title from cover.