HOWIETOUN PONDS. 



255 



wooden seat. This seat is formed by the top of a frame enclosing a 

 straight-eye branch on the 8 -inch iron pipe which runs below the 



FIG. 173 scale 



300-feets. A large ring is riveted to the valve, and so placed as 

 not to catch the net when the pond is drawn (Fig. 174). To lift 



/ ' 10 '-. 



FIG. 174 scale 



the valve a light flat-bottomed boat is employed, and a rope passed 

 across the pond and fastened to the boat holds it in position over 

 the valve. An iron rod, terminating in a hook, is used as a probe, 

 and the brass valve thus easily found, its position being roughly 

 determined by marks on the bank. The hook is inserted in the 

 ring, and the rope slacked from the boat, and made fast to the rod. 

 Three men on the bank can then lift the valve. I at first guarded 

 the pipe by means of an iron grating fitted below the valve, so 



