. Useful information for cotton manufacturers . ^ desire to use hygro-meters, the accompanying tables at the end of this chapterwill be found concise and condensed. Such hygrometers are what may be termed continuous in-dicating, and were it not for certain drawbacks would be idealinstruments: these drawbacks are indicated by the precau-tions that are necessary and usually given for tlieir use, viz. : Hygrometers should be exposed in the shade free from air currents. The covering of the wet bulb must be very thin. The bulb must be constantly moist. The supply of water must be ample in dry weath
. Useful information for cotton manufacturers . ^ desire to use hygro-meters, the accompanying tables at the end of this chapterwill be found concise and condensed. Such hygrometers are what may be termed continuous in-dicating, and were it not for certain drawbacks would be idealinstruments: these drawbacks are indicated by the precau-tions that are necessary and usually given for tlieir use, viz. : Hygrometers should be exposed in the shade free from air currents. The covering of the wet bulb must be very thin. The bulb must be constantly moist. The supply of water must be ample in dry weather. Use distilled, rain, or softest water procvirable, for wet bulb. When lime deposits from use of hard water, change muslin and wick. Dust and blacks must not be allowed to accumulate on muslin. Wash occasionall\- while in use. 1309 STUART W. CRAMER. Even if distilled water be used, the dust in the atmos-phere will cause encrustation ver}- quickly and floating bac-teria will cultivate a growth of stainor even slime in a day or two at the wicks and coveringsdaily is the only guarantee of accuracyof indication, a troublesome, fussy lit-tle job that is generally put off as longas possible, with the result that fewhygrometers are anything like in cor-rect working condition, as can be easilvverified in the best manufacturingplants in this country or abroad. The accompanying cut illustrates awet and dry bulb hygrometer that is ofexcellent construction and design. Many attempts have been made todevise hygrometers that would take^..._„ ... tiig place of this wet and dry bulb type H -M of instrument, but they have all been ^____ ^ ignominious failures, they generally depending upon the behavior of vege-table or animal fibres or materials un-der different atmospheric conditions. For convenience, thistype of hygrometer may b
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcottonm, bookyear1904
