Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 255
issue are hygroscopic; ropes and catgut stringsshorten when moist, hair from which the oil has been removed,lengthens. A well known instrument of this type is Saussureshair hygrometer (see Fig. 155). Another principle is used in the August psychrometer orwet and dry bulb thermometers (Fig. 156).… … Fig. 154. HYGROMETRY. 239 of this thermometer lowers its temperature and the difference ofthe readings of the two thermometers is a definite function of therelative humidity and temperature of the air. Frequently the wet thermometer whose bulb is surrounded bymuslin is simply moistened and then…
Physics
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