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“A representation of a section of a grate and chimney. C D represents the light and warm column of air within the chimney, and A B the cold and heavy column of air outside the chimney. The column A B being cold and heavy presses down, the column C D being light and warm rushes up, and the greater the difference between the weight of these two columns, the greater will be the draught.” —Wells, 1857


David A. Wells The Science of Common Things; A Familiar Explanation of the First Principles of Physical Science214


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