DISPOSAL OP EXCEETA 363 



This type of drain is very often spoiled by the intro- 

 duction of traps in the stable, into which the contents are 

 emptied, and thus the system is vitiated. The iron-covered 

 surface drain is only suited to small stables, and if traps 

 are mtroduced the expense might as well be avoided. 



Fig. 148.— Vitrified Blue Paving Briclc. 

 9 inches x 4J inches x 3 inches deep (2 panels). 



Paving. — It is here convenient to consider the question 

 of paving, which is so intimately associated with the surface 

 drainage of stables. Its general principles have already 

 been considered (p. 282), but there are constructive details 

 which must now occupy our attention. 



Fig. 149. — Vitrified Blue Paving Brick. 

 9 inches x 4J inches x 3 inches deep (8 panels). 



Figs. 148-151 show different forms of grooved bricks 

 used in stables ; it is far from clear what advantage one 

 has over the other, though the general conception of the 

 part these grooves play is that they prevent slipping. This 

 is certainly not the case. There is no brick which can 



Digitized by Microsoft® 



