A Comprehensive Reference Book on Practical Coal Mining ... Fourth edition
A fourth-edition technical reference on practical coal mining compiled by William Wardle, F.S.Sc., and published in London by the Colliery Guardian Co. in 1891 for colliery managers, engineers, and mining students sitting certificate examinations. The 329 numbered figures are fine-line engineered diagrams, mostly sectional views of safety lamps, anemometers, and ventilating apparatus with airflow arrows, hatched metal walls, and italic letter keys, useful as ready-made cutaway schematics and mechanical detail motifs.
