594 



EVERYDAY SCIENCE 



B 



m 





-c 



2 inches greater in diameter and a little over 2 inches greater in 

 height. This tin serves as the outside container. If such a tin can- 

 not be had, procure a covered tin bucket of as great, or greater, 

 dimensions. 



Mix enough water with the asbestos insulating cement to make 

 a plastic paste. Cover the bottom of the tin with an inch of this 



paste (A] . Now mold up a wall of 

 asbestos (TFTF) of even thickness, 

 so as to form a well or nest 7 inches 

 deep and scant 4 inches in diam- 

 eter. 



When the asbestos cement is dry, 

 line the well and cover the top of 

 the asbestos wall with cheesecloth. 

 This may be pasted on with flour 

 paste, rice paste, library paste, or 

 paper-hanger's paste. The latter 

 may be bought in small cartons at 

 any paint store. 



When the jar (B) is placed in the 

 well, the top of the jar should be 



FIGURE 15. CROSS SECTION OF even with the top of the asbestos 

 INSULATED BOTTLE. ^ and there ghould be an Qpen 



insuialLT^ttot oftn! ^ f a ^ * ^ * 

 WW, asbestos wall ; P, insulat- below the cover of the can. To fill 

 ing pad; B, Ball-Mason jar; this space, make a newspaper pad. 

 C, cover for tin. /->. i / 



Cut circular pieces of newspaper to 



fit the space, until you have enough to make a pad of sufficient 

 thickness to fill the space (P). Quilt them together and cover the 

 pad with denim. 



An insulated jar made in this way will keep liquids hot or cold 

 for 10 or 12 hours. A pint jar may be insulated in a smaller con- 

 tainer, if preferred. 



There are several reasons why a Ball-Mason jar is superior to 

 an ordinary bottle in the device described : it may be tightly 

 sealed; it is less likely to break when filled with hot liquids; it 



