SHEEP DIPPING TANKS 



i!DD 



depend on availability and cost in the district where the tank is to be 

 erected. For instance, it may be cheaper to erect stone fences, con- 

 sisting of flat stones laid in dagga. 



Gates. — These are often made of wood, but iron gates may be used, 

 either tubular or of other types. Iron gates would probably prove 

 more serviceable than wooden ones. The latter, if used, should be well 

 tarred. 



The gate used in the outslope (see Figs. 198 and 199) is a gate from 

 an old Cooper's dipping bath, and that shown in the accompanying 

 drawings is of similar design. This gate 

 should preferably be made entirely of 

 iron, as a wooden gate will soon rot and 

 fall to pieces. The balance weight may 

 be wrapped round with sacking to prevent 

 it from injuring the edge of the tank on 

 which it rests when the gate is open. 

 Perhaps a better arrangement would be to 

 fix a piece of hardwood on the top of the 

 edge of the tank at the spot upon which the 

 weight descends. This block of wood may 

 be fixed by two §-inch bolts built into the 

 wall of the tank. 



The brackets which support the gate are 

 set into blocks of concrete in the side walls 



of the outslope. A few bricks are omitted from the walls where the 

 brackets are to be fixed, and the latter are then concreted in place, the 

 concrete taking the place of the bricks which were omitted. 



Lime Mortar. — Consists of one part blue hydraulic lime to three 

 parts clean sand, mixed dry till the mixture assumes a uniform 

 colour, then mixed thoroughly with water. The mortar should then 

 be made into a pile which is covered with sacks and left for ten days. 

 At the end of this period the mortar may be used after first having 

 been remixed with a little water. 



Concrete. — The concrete used for this dipping tank is 1 to 2 to 

 3 concrete, that is to say, it consists of one part cement to two 

 parts clean sand to three parts broken stones, small enough to 

 pass a 1^-inch ring. These are mixed dry by turning over with a 

 shovel at least twice, or until the mixture assumes a uniform colour. 



Fig. 199. 



