52 



MAKAGEMENT Ol' DAIRY PLANTS 



TABLE I 



Transmission of Heat through Various Insuxating Structures 



Structures 



n 



S/8-in. oak — paper, i in. lampblack, 7/8-in. pine. (This is 



the ordinary small stock family refrigerator.) 



One 7/8-in. board, i-in. pitch, i 7/8-in. board 



Four 7/8-in. spruce boards, two papers, solid, no air space 

 Two double boards and paper (four 7/8-in. boards), and one 



air space .' 



One 7/8-in. board, 2-in. pitch, one 7/8-in. board 



One 7/8-in. board, 2>^-in. mineral wool, paper, one 7/8-in 



board 



Two 7/8-in. double boards and two papers, i-in. hair felt. , 

 Two 7/8-in. boards and paper, i-in. sheet cork, two 7/8-in. 



boards and paper 



One 7/8-in. board, paper, 2-in. calcined pumice, paper and 



7/8-in. board 



Four double 7/8-in. boards with paper between (eight 



boards) and three 8-in. air spaces 



Hair-quilt insulator, four boards, four quilts, hair 



One 7-in. board, 6-in. pat. silicated strawboard, air cell 



finished inside with thin layer pat. cement 



One 7/8-in. board, paper, 3-in. sheet cork, paper, one 7/8-in. 



board 



Two 7/8-in. boards and paper, 8-in. mill shavings and paper, 



two 7/8-in. boards and paper 



Same slightly moist 



Same damp 



Double boards and paper, i-in. air, 4-in. sheet cork, paper, 



one 7/8-in. board 



Same, with 5-in. sheet cork 



7/8-in. board, paper, i-in. mineral wool, paper, 7/8-in. board 

 Double boards and papers, 4-in. granulated cork, double 



boards and paper 



1-7 



48. 



C. Insulating Walls. — Pine wood is a good insulator. When 

 used for walls, the value for n has been given as 2 B. T. U. 



