Handy man's workshop and laboratory . nd thereforemade as light and compact aspossible. It consists of acylinder A of bright tin andan outer tin box B havingthe space between them filledwith the wool C, a part ofwhich is sewed up into a mat-tress or cushion E. The bot-tle D must in all cases be pro-vided with a tight rubber ringto prevent spilling the con-tents, and, what is equallyimportant, to avoid moisten-ing the wool. The bottle maybe a quart milk bottle or aone or two quart fruit sizes do not hold theirheat long enough to be worth while. The thickness of the wool packing must
Handy man's workshop and laboratory . nd thereforemade as light and compact aspossible. It consists of acylinder A of bright tin andan outer tin box B havingthe space between them filledwith the wool C, a part ofwhich is sewed up into a mat-tress or cushion E. The bot-tle D must in all cases be pro-vided with a tight rubber ringto prevent spilling the con-tents, and, what is equallyimportant, to avoid moisten-ing the wool. The bottle maybe a quart milk bottle or aone or two quart fruit sizes do not hold theirheat long enough to be worth while. The thickness of the wool packing must be 1^ inchesthick at the very least, and when portability is not necessary itis desirable to have a thickness of from four to six inches. Inthe latter cases the outer box may be made square and of woodwith a hinged cover. Made as described, a bottle of this kind can be depended uponto keep its contents reasonably hot or cold for from six hours toan entire day, depending mostly on the thickness of the packingand its composition.—95. Fig. 275.—A heat retaining bottle 336 HANDY MAN S WORKSHOP AND LABORATORY ICELESS REFRIGERATION While the mad race for supremacy between the mercury andprice of ice is on much comfort can be taken in the factthat there are other methods of keeping victuals cool besidesthat of melting ice in an ice box. If in changing from thesolid to the liquid state water absorbs sufficient heat to keep anice box cool, it is equally true that a change from the liquid tothe gaseous state will result in refrigeration, provided, of course,the rate of vaporization keeps pace with the heat which entersthe ice box from the outside atmosphere. Under proper condi-tions it is possible by this method to maintain a sufficiently low
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