260 



STATE BOARD OF AGRICULTURE. 



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Fig- 20. Door used in silos shown in Figs. 

 21 and 28. 



Fig. 27. Steel door frame with doors used in the 

 silo owned by William Schipper. (Fig. 28). 



Fig. 24. These pieces act also as supports to which are nailed pieces 

 of 2 X 4 for frames for chute, and for ladder for reaching the upper por- 

 tions of the doorway. 



The doors, made in sections, are formed of two thicknesses of floor- 

 ing with two thicknesses of tar pajter between. The inner thickness of 



