Should be filled in compactly with hard, coarse materials, such as stones, brickbats, clinkers, burned clay, &c., on which should be laid 2 or 3 in. [Please select]
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Do not allow clinkers to form | Because they reduce the effective on side or bridge walls. [Please select]
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Keep the ash pit free from ashes | To prevent warping and burning out and hot clinkers. [Please select]
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They must have appeared first as crusts and clinkers. [Please select]
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Some of them, unequally expanded, strained and twisted; its grate-bars and fire-box had become choked with "clinkers," and its tubes charged with coke. [Please select]
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