STEEL REINFORCEMENT 275 



With the Gabriel system of floor construction, hollow tile 

 is also used, as illustrated in Fig. 7. The system shown in 

 view (a) is suitable only for very light construction. The 

 hollow tiles a are sandwiched between reinforced-concrete 

 joists, as at b, and the reinforcement of the floor consists of 

 a main reinforcing bar c, around which a round-iron stirrup 

 is wrapped so as to extend continuously. A similar con- 

 struction is shown in view (fc). Here, however, a slab of 



<*) 



FIG. 7 



concrete is extended over the top of the tile, thus giving 

 additional compressive strength at the top of the concrete 

 beams and permitting this construction to be used for 

 heavier loads. 



Mushroom System of Reinforcement. A system of rein- 

 forced-concrete construction that differs from all others in 

 that no beams nor girders are used throughout is illustrated 

 in Fig. 8. This system of construction, termed the mushroom 



