Page 32 



Operating Air-Cooled Apple 

 Storage Houses 



Continued from page 10. 

 through the vents and air shafts at 

 the ceiling. 



This action is almost exactly the 

 same as in an ordinary chimney, the 

 only difference being that the air in 

 the ventilating flue is not nearly as 

 warm as that in the chimney; there- 

 fore, the tendency to produce a draft 

 in the flue is very much less than in 

 a chimney of equal height. The dif- 

 ference in air pressure induced by 

 the difference in air temperature is 

 so slight that circulation is easily 

 checked if the air passages are small 

 or crooked. To obtain free, abundant 

 circulation it is necessary that the air 

 openings be of liberal size, that the 

 air shafts be straight and direct, and 

 that these shafts extend through the 

 roof to a considerable height above it. 



To cool a large mass of warm fruit 

 in a storage house requires the circu- 

 lation of very large volumes of air. 

 To cool the fruit at all quickly the air 

 must either be very cold or the cir- 

 culation must be very rapid. Warm 

 fruit in closed boxes or barrels will 

 stand a current of air at freezing tem- 

 peratures for several hours without 



BETTER FRUIT 



damage by freezing. The cooling of 

 boxed or barreled fruit by a gentle 

 current of moderately cold air is 

 therefore necessarily extremely slow. 

 The temperature of the fruit, even 

 near the outside of the package, 

 changes but slowly. Farther inside 

 the package there may be no appreci- 

 able cooling until the outside fruit is 

 materially cooled. Likewise, packages 

 within large compact stacks of fruit 

 will not commence to cool to any ex- 

 tent until the outside packages have 

 been reduced considerably in tempera- 

 ture. 



The slowness with which the fruit 

 is cooled, even under the best of con- 

 ditions, emphasizes strongly the need 

 of both the free and the rapid circu- 

 lation of cold air. The necessity for 

 free, unobstructed circulation is fur- 

 ther increased in the early autumn, 

 when the coolest outdoor tempera- 

 tures are moderately warm. In order 

 to accomplish any appreciable cooling 

 at such times, large volumes of air 

 must be circulated through the fruit. 

 Quick, prompt cooling may add 

 weeks, even months, to the period 

 during which apples can be held in 

 good condition. The relatively short 

 time during which apples can be kept 

 in good condition in some storage 



j P ^Tir<^\\\\\^^nhiir7n\\\(f^n^rT7tnnTrfDi^\\\\'iTT\\/, 



September, 1920 



BEST SERVICE- 

 QUALITY a PRICES 



PERFECTION IN 



FRUIT 

 V LABELS/ 



ffs ■? **i£± 



1423-24 NORTHWESTERN BANK Bit 

 PORTLAND/OREGON. 



E.Shelley Morgan 



NORTH WESTERN MANA GER 



WE CARRY -AND CAN SHIP IN 24 

 HOURS-STOCK LABELS FOR PEARS. 

 APPLES.CHERRIES & STRAWBERRIES. 



Established 1882 



O 



- frttieMTJm/v" 



Showing method of ventilating a modern air-cooled storage house built of hollow tile. 



HUM* 



^Company 



Printers 



WE print anything 

 from the smallest 

 to the largest and always 

 welcome orders of any 

 size or quantity, giving 

 prompt, personal and 

 efficient service. 

 Mail or phone inquiries 

 are solicited. We do not 

 specialize — experience 

 and equipment enable 

 us to print everything 

 equally well. We render 

 service in preparing 

 copy and illustrations 

 and furnish plans and 

 estimates for catalogs, 

 booklets, publications, 

 billboard and any other 

 kind of advertising. 



First and Oak Streets 

 Main 165; Auto 51 1-65 



Portland, Oregon 



RITINC ADVERTISERS MENTION BETTER FRUIT 



