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 219
ial the percent-age of atmospheric humidity. That shown in Fig. 160 is one ofthe common forms. Instruments of this kind depend for theiraction on the absorptive property of catgut or other materialsthat are sensitive to the moisture changes of the air. These instruments give fairly accurate… … Fig. 160.—Dial hygrometer. ATMOSPHERIC HUMIDITY 209 readings cannot be relied upon for definite amounts of atmos-pheric moisture. The Swiss Cottage Barometer.—Fig. 161 is one of theinstruments of absorptive class that are sometimes used asweather indicators. The images which occupy the openings…
Heating · Lighting · Plumbing
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