Statistics for occurrence #1 of “Sir John Winter” in chapter 6, entry fireplace of Knight's Mechanical Encyclopedia:

...tered at a, passed along the chambers b, and entered the room at c c. D is Prince Rupert's fireplace, somewhat celebrated in its time. It had a diving flue and false fire-back. About 1658, Sir John Winter invented a coke furnace or fire-cage (C) which was placed on a close box about eleven inches high, in front of which was an opening d, fitted with a door, which always kept closed except when the ash...
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