ate, which is hollow and contains w^ater. Thefresh air is taken in above this fire, and the flames plunge down through openings inthis grate. Burning coals, also, drop through these holes, forming a shallow, incan-descent bed of fuel on the lower grate. The heavy black smoke, full of unburnt… … RESULT. DETAIL OFCONSTRUC-TION. GUARANTEE With soft coal, slack or screenings, a result is obtained which compares favorablywith other boilers burning high-grade anthraciteethe fuel bill is, consequently, cut inhalf. The smoke from this boiler is as colorless as when anthracite coal has beenused.…
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![An illustration from Current architecture: published in connection with a joint exibition [sic] held in Boston November 1916 (1916)](https://img.insideoutlibrary.com/img/200/ia-currentarchitect1916bost-128-186.webp)
