330 BUILDING DETAILS 



enlarged at b so as to receive the head of the bolt. In order 

 that the casting may be securely held in the concrete work, 

 it is arranged with a plate d and connecting pieces e. On 

 the sides of the socket at the face are cast notches c into 

 which nails may be driven so that the device may be secured 

 to the forms. The Bigelow socket is made for J-, A-, f-, 

 A-, ^-, and f-in. bolts. The smaller sizes are suitable for 

 embedment in slab work, and the ^-, *-, and J-in. sizes may 

 be used in beams and girders. 



(d) 



(f) 



In (f) is shown a sheet-steel socket. It is cut, as shown 

 at a, so as to fit around the beam reinforcing bars /. In (g) 

 is shown separately the cap that fits over the nut held by 

 the socket into which the stud bolt fits. 



Continuous Inserts for T-Headed Bolts. In the construc- 

 tion of factory buildings it is sometimes desirable to arrange 

 a slot in the bottom of the concrete beams and girders so 



