Transactions . Fig. 1.—Mason Hygrometerfor fixing against a wall, etc., for use ix coal-mines, etc. Fig. 2.—Mason Hygro-meter : PORTABLEform for use ixCoal-mines. tion from the muslin and consequent cooling of the bulb beingin proportion to the dryness of the air. The difference of thereadings of the two thermometers will be greatest when the air isdriest, and these will read alike when the air is completelysaturated with moisture. The Mason hygrometer is usually constructed so as to be affixedto a wall in any convenient position. The scales are made of porce-lain, so that they are easily clea
Transactions . Fig. 1.—Mason Hygrometerfor fixing against a wall, etc., for use ix coal-mines, etc. Fig. 2.—Mason Hygro-meter : PORTABLEform for use ixCoal-mines. tion from the muslin and consequent cooling of the bulb beingin proportion to the dryness of the air. The difference of thereadings of the two thermometers will be greatest when the air isdriest, and these will read alike when the air is completelysaturated with moisture. The Mason hygrometer is usually constructed so as to be affixedto a wall in any convenient position. The scales are made of porce-lain, so that they are easily cleaned and practically form is constructed so that it can be carried from place toplace. Fig. 1 shows a Mason hygrometer with its tubes well 272 APPLICATION OF THE HYGROMETER IN COAL-MINES. apart. A web separates the dry and wet bulbs, so that theevaporation from the wet bulb will not reduce the temperatureof the dry bulb; the case protects the scales and tubes fromdamage. This form is i
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1887
