Commercial rose culture under glass and outdoors; a practical guide to modern methods of growing the rose for market purposes . there isnot so much danger of getting burned in this way. ALLOWABLE SIZES OF SAFETY VALVES FOR STEAM HEATING BOILERS (Maximum Allowable Working Pressure, 15 lbs. per sq. in.) Water Evaporated per sq. Surface per Hr., Lb. Diameter of Area of Valve Valve In. Sq. In. 1 IH IK 2 2K 3 SVz 4 43^ 50 75 100 Area of Grate, Sq. Ft. 125 4
Commercial rose culture under glass and outdoors; a practical guide to modern methods of growing the rose for market purposes . there isnot so much danger of getting burned in this way. ALLOWABLE SIZES OF SAFETY VALVES FOR STEAM HEATING BOILERS (Maximum Allowable Working Pressure, 15 lbs. per sq. in.) Water Evaporated per sq. Surface per Hr., Lb. Diameter of Area of Valve Valve In. Sq. In. 1 IH IK 2 2K 3 SVz 4 43^ 50 75 100 Area of Grate, Sq. Ft. 125 Boiler Troubles Foaming in a boiler is shown by the jumping up and downof the water in the glass and is caused by dirty water and byforcing a boiler beyond its capacity. It can be remedied bycleaning out the boiler as soon as possible. Care should betaken that water does not leak down on to the outside of aboiler; if this happens corrosion will take place in a short time. 182 COMMERCIAL ROSE CULTURE. Rose Mrs. Aaron WardPossesses handsome foliage, produces enormous crops. extra warmth in WinterPhoto courtesy E. G. Hill Co., Richmond, Ind. Likes a little STEAM HEATING AND ENGINEERING 183 Boiler tubes should be scraped out occasionally as a thincarbonaceous scale is liable to form which results in a greatwaste of fuel. This scraping is in addition to the brush or tothe blowing out with a jet of steam. It is estimated that 15per cent more fuel is used in a dirty boiler than in a cleanone to obtain the same amount of heat. The Chimney To get the best results from a chimney every bit of air thatenters it should pass through the grates. Round chimneysare better than square ones for the gases ascend in a spiralmotion. In their construction brick is better than iron, forthe current does not get cooled off so much in its ascent. Feeding the Boiler Be careful when
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrosecul, bookyear1919
