98 
PRESERVATION OF FOOD BY REFRIGERATION ; 
Average temperature of cold air on leaving 
the expansion cylinder (six weeks’ sca — 79° 
observation) axe 
Rise in temperature of the air that should 
occur for leakage and the abstraction os} 50°35 
heat from the meat 
Theoretical temperature of the returning cold) _ Be 
air after passing through the rooms 7 
Actual temperature as evidenced by six weeks’ o 
work ars ae Je BP Brg Mes 
Difference due to leakage, &c. wd wn onrye 
As the difference in temperature between the atmosphere and 
the cold air is about 150°, a loss of 35° forms 23 per cent. of the 
total work of the engine. 
