SHEEP DIPPING TANKS 251 



corner post, next the circular part of the tank, does not enter the wall 

 of the tank, but simply rests thereon, being held in position by the 

 2" by 3" rails already referred to. The end of the decoy pen 

 next the inslide should have the jackal netting strongly reinforced by 

 horizontal wires spaced about 1^ inches apart, projecting ends of wires 

 being avoided, as sheep sometimes jump right across the inslide and strike 

 against this end of the decoy pen. 



While the decoy sheep seldom induce a sheep to walk voluntarily 

 on to the slide, it is found that screening the sheep in the decoy pen 

 and in the dripping pen from the view of the entering sheep has the 

 effect of making it considerably more difficult to get these sheep on to 

 the inslide. 



The decoy pen is provided with a small gate and is flagged. 



Dripping Pens. — There are two dripping pens, each 12 feet by 16 feet, 

 draining towards a gutter which discharges through a perforated zinc 

 plate (which retains droppings) into a sump (see Figs. 194 and 196) 

 where dirt may settle. From the sump a 4-inch earthenware pipe returns 

 the drippings to the tank. 



The dripping pens are filled with sheep alternately, by throwing over 

 the diversion gate at the top of the outslope. When one dripping pen 

 is full the sheep are left therein to drip, but meanwhile the other can be 

 filled with sheep from the tank, so that there need be no interruption in 

 the dipping. 



The dripping pens are flagged. The flags are laid on a layer of sand 

 or fine gravel, and the joints filled with lime mortar up to f -inch from 

 the surface. The joints are then pointed by filling the remaining f-inch 

 with 1 to 2 cement mortar. 



Before making the joints each flag must be solidly bedded down on 

 the sand, and should be tested by hitting it round the edges with a 

 hammer, when it should not yield or cant. 



The flags in the race and decoy pen should be similarly laid. 



The floors of the dripping pens slope towards the gutter at the rate 

 of 1 inch in '5 feet, and they also have a slight slope towards the line S.T. 

 (see Fig. 193). 



The gutter is formed in 1 to 2 to 3 cement concrete, plastered with 

 1 to 2 cement mortar, and has a slope of 1 inch in 7 feet towards 

 the sump. 



In order to prevent rain-water, which may fall on the dripping pens, 



