Heating and ventilating buildings : a manual for heating engineers and architects . ach section. The steamor hot water is drawn off from a similardrum, B, which extends over the top of -Hthe heater and is connected with eachsection by a screwed nipple. Fig. 131 ~Jshows methods of attaching steam- and FlG- T3T- water gauges. This form is used quite extensively in steam-heating and to some extent for hot-water heating. 83, Heating-boilers with Magazines.—Many of the heat-ing-boilers are manufactured as required with or without amagazine to hold a supply of coal. The magazine in mostcases consist
Heating and ventilating buildings : a manual for heating engineers and architects . ach section. The steamor hot water is drawn off from a similardrum, B, which extends over the top of -Hthe heater and is connected with eachsection by a screwed nipple. Fig. 131 ~Jshows methods of attaching steam- and FlG- T3T- water gauges. This form is used quite extensively in steam-heating and to some extent for hot-water heating. 83, Heating-boilers with Magazines.—Many of the heat-ing-boilers are manufactured as required with or without amagazine to hold a supply of coal. The magazine in mostcases consists of a cylindrical tube opening at or near the topof the heater and ending eight to twelve inches above thegrate. The magazine is filled with coal, which descend? as com-bustion takes place at the lower end, and provides fuel forfurther combustion (see Fig. 121). The magazine works suc-cessfully witli anthracite coal, which is that ordinarily employedin domestic heating, but it takes up useful space in the heater,decreases the effective heating surface for a given size, and in. 172 HEATING AND VENTILATING BUILDINGS. that respect is objectionable. The writers own experiencewould lead him to believe that the magazine heater, except invery small sizes, requires as much attention as the surfaceburner, and consequently has no special advantage.* 84. Heating-boilers for Soft Coal.—It is quite probablethat no furnace, either for power or heating boilers, has yetbeen produced which will consume soft coal without more orless black smoke. This smoke is due principally to the imper-fect combustion of the hydrocarbons contained in the coal. Thehydrogen burning out after the gases have left the fire leavessolid carbon in the form of small particles, which float with anddiscolors the products of combustion. The amount of loss asfound by experiment in Sibley College, even when blacksmoke is produced, seldom reaches one per cent, and is of noeconomical importance. The sooty matter p
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