98 



FAEM BUILDINGS IN SOUTH AFRICA 



the door is provided with a groove which runs over a 3" by §" wrought 

 iron bar bedded in the concrete sill, and projecting about 1 inch. 

 The bottom of the door should clear the top of the sill by about 

 -§ inch. 



The rollers rotate on f-inch pins carried by 3" by § " wrought-iron 

 "suspender" bars B, which are securely bolted to the styles of the 

 door by ^-inch bolts, as shown. The bars B are strong enough to resist 

 the thrust of a heavy animal against the door. This is often a point 

 of weakness in the types of rollers bought ready-made which, in 

 consequence, soon get out of working order. 



-Two 9"* 3" Deals- 



-WfiLL 



ZZEJ 



Pig. 10G. 



The sliding door illustrated by Figs. 107 and 108 possesses some 

 good features. The framework only is of wood, being clad with 24 

 gauge sheet iron nailed on with either flat-headed nails or wood screws. 

 The bottom of the door is provided with two 1" by \" wrought-iron 

 pins which slide in a groove formed by two 3J" by 2£" angle-irons 

 bedded in the concrete. These angle-irons are held by a number of 

 -jj-inch bolts, and are kept apart by distance-pieces consisting of short 

 lengths of pipe slipped over the bolts, as shown in Fig. 108. The latter 

 figure shows how the wrought-iron pins are attached to the framework 

 of the door, and also how the angle-irons are bedded in the concrete, etc. 

 This arrangement, of having only a pin at each end of the door running 



