A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 223
ome the friction, asmooth pipe offering less resistance than a rough one. Hence,metal pipes are to be preferred, in this respect, to brickconduits. A polished pipe offers less resistance than a smoothone not polished. A pipe or flue havingnts inside coveredwith soot offers much greater resistance… … Fig. 3. 17 OF BUILDINGS. 27 and to move sideways sufficiently to pass by the obstruc-tion, consequently the current loses some of its kineticenergy.
Architecture · Building
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