Page:Encyclopædia Britannica, Ninth Edition, v. 11.djvu/626

592  1em

Units of Heat per Square Foot per Hour. 19.4 0 vu lu 20° 3% 40° Su? 69° 7U° bu° 90° 100" 110° 120° 130° 140° 150° 160° 17u° 180" 19U° 200°

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