File:Cyclopedia of textile work - a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects (1907) (14586109258).jpg

Identifier: cyclopediaoftext06chic (find matches)
Title: Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects
Year: 1907 (1900s)
Authors:
Subjects: Textile industry Textile fabrics
Publisher: Chicago : American school of correspondence
Contributing Library: Claire T. Carney Library, University of Massachusetts Dartmouth
Digitizing Sponsor: Claire T. Carney Library, University of Massachusetts Dartmouth

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Fig. 74. Steam Heated StiU. finally issues at II as distilled. A bafile plate F may be locatedin the head of the still to prevent any water from being carriedover mechanically in case the water in A should boil too violently. In works where only a limited amount of pure water is re-quired, it is sometimes the practice to condense direct steam fromthe boilers, or indirect steam that has already been used for heat-ing purposes or otherwise. In this way a comparatively purewater is obtained, but its purity cannot always be depended upon,as oil, which is volatile with steam, is likely to get into it in vari-ous ways, and iron rust from steam pipes occasionally causestrouble. 221. Rain Water. Rain water may be considered a natu-rally distilled water. Evaporation is constantly going on at the 218
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< 3 TEXTILE CHEMISTKV AM) DVEiNG ii()9 surface of all bodies of water exposed to the atmosphere, and thewater vapor thus formed, being lighter than the air, rises. Theamount of evaporation varies, being but little upon a cold dampday but very great upon a warm and dry day. As the warm air,partially saturated with moisture, rises, it eventually becomescooled to a point where a large proportion of the moisture it holdscondenses out as clouds, which, being carried about by the variouscurrents of air, constantly increase in density until they become soheavy that the water falls to the earth as rain. Eain water, however, is never absolutely pure, for it alwayscontains a certain amount of foreign matter, usually of a volatilechai-actei-. The degree of purity of rain water dej)en(ls chiefly upon twoconditions, /. e.: the locality and the period of the storm durino-which the rain fell. In a large city where many industrialestablishments, such as gas works, bleacheries, chemical works,etc.,

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