Mr. George S. Hudson 



197 



The writer has adapted the following modi- 

 fication of the above plan to a portion of an 

 old-fashioned sun-drying- "boucan," with a capa- 

 city of six tiers of four trays each, or twenty- 

 four trays in all. The interior compartment of 

 eight of these trays (i.e., two tiers) has been 

 made air tight (with double walls filled with 

 sand), and fitted with specially tight shutters 

 and hinged steel rails that obviate the neces- 

 sity of any rail hole in the shutter, yet allow of 

 the trays being run out into the sunlight when 

 the shutters are removed and the hinged rails 

 swung into position. It was found that a single 

 ceiling in the centre of the tier broken by an 

 i8-in. space at the end furthest from the 

 stove acted better than a ceiling over each 

 plane of trays. The diagram of the " boucan " 

 is, roughly, thus : 



for sun drying only 



Adapted fo both sun 

 <f ho fair drying 



Blackmanfan 



Mr. Hudson's modification of the " Whitfield Smith" Hot-air 

 Dryer. 



This arrangement must be regarded as an 



