Fig. (10) System No. 1A. 



This system is a very popular form of construction. It is adapted for office buildings, hotels, 

 apartment houses, hospitals, schools, roofs, etc. The protection of the lower flange of the sup- 

 porting beams makes -it an ideal fireproof construction. It may be used with or without the sus- 

 pended ceiling construction as here shown. 



Fig. (11) System No. IB. 



This system is similar to No. 1A. It is adapted for the same class of buildings wherever 

 beam protection is considered unnecessary. The advantages of this system are that it is easily 

 erected in addition to being strong and safe. The open panel construction is here shown. 



