MARKETING WESTERN BOXED APPLES 23 
out the storage season. Correct temperatures for long periods can 
not be maintained in common storage even of the best type. In 
Figure 13 boxed apples in cold storage are shown stacked with air 
spaces for ventilation. 
Fic. 13.—Boxed apples in cold storage 
The approved construction features for either a good cold storage 
or common storage are identical as to use of similar building and 
insulating materials. In the apple-producing valleys of the Pacific 
Northwest most cold storages are of masonry or poured concrete 
construction (fig. 14). Insulation materials consist mainly of either 
dry planer shavings or cork. Mechanical refrigeration with tempera- 
tures 30 to 32° F. is supplied either by piping the refrigerant directly 
through the storage rooms, or by the use of a bunker system in which 
Fic. 14—Cold storage in producing section; a large plant devoted mostly to boxed apples 
the refrigerating coils are confined to a separate room and the cold 
and rather moist air supplied from it to the storage room by means 
of alargefan. There ahuld be sufficient moisture to prevent shriv- 
eling, yet not enough to favor the growth of fungous organisms. 
