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Updated: May 13, 2025
The first flue past the actual furnace shown with ordinary dead-plate, raking fire-bars, ashpit, fire-door, and ashpit door for regulating draught has walls 4-1/2 in. thick; above, smaller bricks, 3 in. wide; but in a larger apparatus, 9 in. and 4-1/2 in. respectively would be required. The quarries between flues and air spaces are 24 in. by 24 in. by 3 in., with rebated joints.
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