. Public health and preventive medicine. 4 = 37*5 . Supposing the F. reading is below freezing point, say 14, what willthis correspond to on the C. scale? Subtract 14 from 32, and 18 is this by 5 and divide by 9. This gives — lo on the C. scale. Supposing the F. reading is below zero, say —20° F., what will this corre-spond tn on the C scale? In this case add 32 to —20. The result is this by 5 and divide by 9. The answer is —29 C. -40 C. corresponds to—40 F. - 40 x 9 + 5 = _ 72 . and - 72 + 32 =- 40° F. mktkorology 127 Varieties ofthermometer used in meteorologic

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. Public health and preventive medicine. 4 = 37*5 . Supposing the F. reading is below freezing point, say 14, what willthis correspond to on the C. scale? Subtract 14 from 32, and 18 is this by 5 and divide by 9. This gives — lo on the C. scale. Supposing the F. reading is below zero, say —20° F., what will this corre-spond tn on the C scale? In this case add 32 to —20. The result is this by 5 and divide by 9. The answer is —29 C. -40 C. corresponds to—40 F. - 40 x 9 + 5 = _ 72 . and - 72 + 32 =- 40° F. mktkorology 127 Varieties ofthermometer used in meteorological work. Standard thermometers are for observatory use, and are those with whichother thermometers arc compared. They are made with extreme rare. Ordinary.—These should be regularly tested for displacement of zero. Maximum and minimum.—The maximum contains an ordinary mercurycolumn, and is mounted horizontally. It records the highest temperaturereached since last setting, by means of an index, which may be cither a small.

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