8 MASS. EXPERIMENT STATION BULLETIN 404 



Construction Details 



Figures 1 and 2 show the types of dehydrators recommended. Type 1 is a 

 natural draft dehydrator, and Tj'pe 2 is a forced air unit which allows for recircula- 

 tion of a portion of the heated air. The forced air unit can also be heated with a 250 

 watt "glocoil" of the type used in the common home reflecting bowl heaters, 

 thereby eliminating the need for an external heat source. The convenience of 

 this arrangement recommends its use whenever possible. 



Plywood, one-fourth inch, 3 ply, was used for construction of the dehydrators 

 in the laboratory because of the ease in workmg with materials of this type. How- 

 ever, heavier plywoods, certain composition boards, and lumber from boxes and 

 crates are equally satisfactory. Lumber from crates was used for the braces 



TRAYS 

 COVE.RED WITH 

 GALVANIZED 

 H SCREEN 



MAKE, (o 



8 8 



T^^\ RUNWAYS 



|)l|xl8 STRIPS 

 NAlUtO ON 



SIDE. BRACE 

 (SAME. AS ^T TOP") 

 MAILED ON FLUSH AT 

 BOTTOM 



TOP 



S| 



in 



TOP 



5| 



w 



TOP BRACL 



J)^|xi6 NAlLtD ON 

 X INCH fROtA TOP 



-;y 



SIDES 



MAKE. Z 



-\~^ 



S HOLLS 



f 





SUPPORTS Jx^.LiKGTHOf 

 LESS DtTEKMINED BX Ht\»HT O^ 

 KtAT SOORCt. NAlLEB OH 

 OUTS\Dt. 



«)•*■ 





-!S' 



Figure 4. Dimensions and Diagrams 



