i8 



The Country Gentlemaiis Magazine 



in warehouses. It is 

 commercial value of 



well 



known that the 

 )es is frequently 



Fig. 2. — Anti-Mildew Ventilator. 



reduced by a portion becoming damaged, 

 and then, as the samples taken from each 



the whole cargo thus really becomes reduced 

 in price. This and many other illustrations 

 which might be giver, would shew that the 

 prevention of mildew is not only of high im- 

 portance ■ intrinsically, but considerable ex- 

 penses might be well incurred to avoid the 

 deterioration of large quantities on the voyage. 

 For hay-ricks, too, a good system of internal 

 ventilation would go a long way towards pre- 

 venting heat, or in facilitating drying. The 

 apparatus consists mainly of a system of 

 double tubes, one external, and perforated 

 all over ; the other internal and only perforated 

 at the end of each branch. The arrangement 

 is as follows : — There is first a vertical per- 

 forated cylinder, from which, fore and aft, and 

 port and starboard, perforated arms extend 

 in single or in two or more tiers. The cold 

 air taken in at the bell-mouth of the vertical 

 tube descends, and finds escape partly 

 through its own perforations, and partly 

 through those of its branches, and thus inter- 

 mingles with the grain through every inter- 

 space. When heated, or under pressure in the 

 closed hold, a portion of the air escapes by 



Fig. 3- 



are mixed by the brokers for disposal in the the internal tubes, and thus a constant circu- 

 markets with a view to ensure a fair average, lation is maintained, as may be shewn in the 



