Figure 2 the plaxt press in use 



Double-faced corrugated cardboards, cut so that the corrugations extend the 

 short way, are used between dryers. Heat is supphed by two or three carbon 

 filament electric light bulbs, or by special heating units constructed to fit an 

 ordinary electric light socket. 



Any thickness of press, within the limits of the width of the box, can be 

 used. Boards ij^ or 3 inches wide are provided to fill in the space at the sides 

 of the press on the rack when only a small amount of material is to be dried. 



\'entilation is provided by six one-inch auger holes placed three on each 

 side of the bo.x, 2 inches from the bottom. 



(Photo by M. IV. Gardner) 



