68 PRESERVATION OF FOOD BY REFRIGERATION ; 
“This explanation of the reason why a high wall does not lose 
the same amount asa low one, will give some idea of the cause 
of the difference between bodies having the same area but differing 
in form. Those bodies lose most heat whose form allows the 
most free access and circulation of the air which carries off their 
heat.””—Box, op. cit. 
For a horizontal cylinder the rule becomes— 
A — Ae ere aie 
in which A = the loss in units per square foot of surface 
per hour, for a difference in temperature between the body 
and the air of 1°, and 1+ = the radius of thejcyiimg@enan 
inches. 
Table 5.—Showing the loss of heat from contact of air with hori- 
zontal cylinders per square feot per hour for a difference of 
oan 
tah. 
VaLurE or A FoR HorizonTaL CYLINDERS. 
~ Loss of Heat in : Loss of Heat in 
| Diameter| Units per Square Diameter, Units per Square 
in Foot for 1° we Foot for 1° 
Inches. ditterence, Inches. difference, 
Horizontal Cylinder. Horizontal Cylinder, 
| i 
2 "7280 Hage "4682 
aia 6256 I4 "4648 
ae "5745 15 "4619 
eo "5440 16 "4594 
6 "5230 7, "4571 
508 8 "4551 
i AS!H/ eae tae 
8 "4978 2 "4466 
9 "4892 36 4381 
IO "482 48 "4338 
12 4722 
For a vertical cylinder the rule becomes— 
216 y ; 
A='726+ { a on ar ee: X *2044 
in which A and r have the same signification as before, and h = 
the height in inches. 
