entor proposes to conduct the products of combus- will be considerably reduced. ; tion, rising from the fire, between and around a number of} its heat to the best possible advantage. These gates are coa- In Figs. 1 and 2 are shown longitudinal and transverse nected by gear wheels, G, Fig. 4, so… … Ordinarily, however, it is proposed to employ the return flues, D. These open through the crown sheet of the boiler, pass balls or blocks of metal or other material; so that, the latter down through the water space, thereby carrying the heat being intensely heated, the smoke, gases, etc., coming in…
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