International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 374
he line of sight. A plug is then set on the lineat A, after which the instrument is moved to /vand a plugset at /, thus establishing the line. RAILROAD CONvSTRUCTION. 903 1526. Ventilation. — In clear weather, the gasesformed by the combustion of the powder used in blastingpass rapidly from the…
Railroad engineering
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
