. Railroad structures and estimates . kind is exposed to the smoke fumes. This type of jack isstandard on the C. P. R. The timbers before being put to-gether are saturated in a bath of fire-proof paint. The hood is3 ft. wide by 8 ft. 6 in. long with a 3-ft. square smoke stack ex-tending 6 ft. above the roof, and the jack complete in placecosts about $75 and is expected to last as long as the enginehouse itself. Chimney and Induced Draft. — In residential districts wheresmoke is regulated bj- civic by-laws, or where it would be ofconsiderable annoyance to the community, a high chimney issometim
. Railroad structures and estimates . kind is exposed to the smoke fumes. This type of jack isstandard on the C. P. R. The timbers before being put to-gether are saturated in a bath of fire-proof paint. The hood is3 ft. wide by 8 ft. 6 in. long with a 3-ft. square smoke stack ex-tending 6 ft. above the roof, and the jack complete in placecosts about $75 and is expected to last as long as the enginehouse itself. Chimney and Induced Draft. — In residential districts wheresmoke is regulated bj- civic by-laws, or where it would be ofconsiderable annoyance to the community, a high chimney issometimes built to carrj- the smoke to a point where it wouldnot be objectionable. The smoke jacks instead of extendingabove the roof are connected with a large smoke duct carriedover along the roof to the chimney. The sections of the ductsvary in size according to the number of smoke jack connec-tions it has to carry. To create sufficient draft to carry awaythe smoke from the main duct, induced draft fans are used. WOOD SMOIvE JACKS. 515. SECTION ON Fig. 243b. Wood Mill Type Smoke Jack, C. P. R. Standard. This tj-pe of jack has been iLsed to a verj- large extent on the C. P. the past few yeans and has given good .satisfaction. .\11 of the materialis subjected to a bath of fireproof paint before and it is built up incrib fashion as described on page 514. 516 SMOKE PRECIPITATION. This is an expensive installation and the fact that iron work ofany kind is liable to be attacked and destroyed very quickly bythe gas and sulphuric fumes the installation must be designedwith the greatest care as to the material used and the methodof making the various connections to provide the maximumprotection. Smoke Precipitation. — The precipitation of smoke by the useof high potential electricity and a suitable electric field hasbeen successful in a large number of practical applications inchemical and other works, but has not so far been applieddirectly in the collection o
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