London.British Engineering Standards Association. 1923. [1], 2-123pp. 2 black and white folding plates with many other illustrations and drawings throughout. Original buckram with black type. Octavo. First edition. Head and heel of spin a trifle bumped; extremities a touch rubbed; approx 2cms split to edge of lower spine; endpapers and fore-edges a little browned; some light spotting to fore-edges; withdrawn ex-libris plate; else a very good copy.