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 (7.2, 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 
18-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:— =’ 
Adapted to both sun 
for sun ) ary ing only ad hot air drying 
(Ferl__Ter2__‘Ter 2 Tier "Tier 5 Tier 6 
Blackman fan 
oa) os ee eee 
SS Driving wheel 
Cewi7 
tof fan 
—, ~\ Coo | Od 
Mr. Hudson’s modification of the “ Whitfield Smith” Hot-air. 
Dryer. 
This arrangement must be regarded as an 
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