OK, The Tfrx Out. 



115 



them quite flat, and, at the same time, effectively drain 

 them, has not hitherto been fully considered. Messrs. 



TOP TO Be KEPT LEVEL 



WAT£R LI?,'E \ 



Fig. 5. 



Hassall and Singleton, however, provide us with a gutter 

 which answers this purpose admirably (Fig. 5). 



WATER 

 SUPPLY 



^ 



STABILE 

 DRAIN 



t*"*""-^ Fig. 6. 



It is a covered gutter, with strong loose top-plate, intended 

 to be fixed quite level on the surface, the necessary fall for 



