Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 217
he pointer P placed on theleft-hand scale at the line 65°. The arm is then swung to theright until the pointer touches the downward curving line begin-ning at 77°, the dry-bulb reading. The lower end of the arm Hnow points to the relative humidity, where 52 per cent, is indi-cated by the scale at… … Fig. 158.—The hygrodeik A formof hygrometer in which relative hu-midity is found directly from a dia-gram. ATMOSPHERIC HUMIDITY 207 reads 77°. Referring this data to the humidity table, thecolumn marked 12, for the depression of the wet-bulb ther-mometer and opposite 77° in the air temperature…
Heating · Lighting · Plumbing
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