A manual of practical hygiene for students, physicians, and health officers . l purpose. Whatever is the cause of thedeleterious effects of an atmosphere vitiated by res])iration, whether itIk carbon dioxide or the organic matters given olf by the body, this atleast is certain, tiiat the amount of carbon dioxide serves as an indexof impurity, and that the tunount of aqueous vapor is of considerablesanitary importance. In s])ecial cases, it is important to look for thatmost dangerous contamination, carbon monoxide, which, coining evenin very small amounts from leaking gas ])ipes and other sourc
A manual of practical hygiene for students, physicians, and health officers . l purpose. Whatever is the cause of thedeleterious effects of an atmosphere vitiated by res])iration, whether itIk carbon dioxide or the organic matters given olf by the body, this atleast is certain, tiiat the amount of carbon dioxide serves as an indexof impurity, and that the tunount of aqueous vapor is of considerablesanitary importance. In s])ecial cases, it is important to look for thatmost dangerous contamination, carbon monoxide, which, coining evenin very small amounts from leaking gas ])ipes and other sources, exertsa decidedly deleterious influence. In the minds of many, the test forozone is also of importance. In addition to chemical analysis, the determination of the amountof dust and the number and varieties of micro-organisms present maybe of interest and importance. Determination of Aqueous Vapor.—As has been stated above, avolume of air at a given temperature can hold a definite amount ofmoisture, and no more, and when this amount is present the air is said Fig. Apparatus for direct determination of moisture. to be saturated. The amount which a volume of air contains consti-tutes its absolute humidity, and the difllerence between this and theamount which it is possible for it to hold is known as its saturationdeficiency. The ratio which its absolute humidity bears to its possiblecontent is known as its relative humidity. Direct Determination of Moisture by Weighing.—Prepare two wide-mouthed flasks of about 150 cc. capacity in the following manner: OF Mil. 2(>0 Provide; ( vvilJi w \\\r\\[\y liMin^ i-iiMxr sloppci- willi (wo jHTforatioiiH,tliroii^li wlii<li ;i,r(! iiiHcrle^d two piece- oC <^\:\-r liihin^ hciil. at a right angl(!. One of (Ji(!M(! numlldH In llie liolldlil of I he |l;|<, ;i|ul HrTVCH OH ail inliit ; tlu; o(Ji(!i cxIcikIs only a short (hslunc*; helow th(! hlo|»|»cr,and S(!iV((S as an onllel. Iill (he fhisks wi(h Kni;
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjecthygiene
