Roper's catechism for steam engineers and electricians ..
A question-and-answer handbook of steam and electrical practice by Stephen Roper, revised by Edwin R. Keller and Clayton W. Pike and issued by D. McKay of Philadelphia in 1899 for working engineers and firemen. Pictures are line cuts and sectional diagrams of valves, cylinders, boilers and wiring circuits, with hatched cross-sections, labelled arrows and hand-lettered captions useful as machine-part silhouettes and technical ornament.
