CATTLE DIPPING TANKS . 241 



gauge lines. The numbers on these, viz., 1500-3500 (which may be 

 scribed on the plaster), give the capacity of the tank in gallons when 

 filled to the mark in question. This scale will be fouud useful to 

 measure the relative quantities of water and dipping fluid while the tank 

 is being filled. See Appendix. 



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1 



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Fig. 188. 



The Entering and Dripping Eaces. — The former is flagged to prevent 

 dirt being carried into the tank. In the case of the tank built on 

 this farm, it was found necessary to put iron bars across the jumping- 

 off place to prevent slipping of the animals. Old tyre iron was used, 

 and is most effective. These irons are indicated in Fig. 185. The 

 parts of the irons projecting above the concrete were bored with f-inch 

 holes at 4-inch centres to allow the dipping fluid splashed up to run 

 back to the tank. The dripping race consists of 3£ inches of concrete 

 founded on 6 inches of hard core, and topped by \ inch of 1 to 2 cement 

 plaster, indented with grooves of triangular section about 5 inches apart 

 from centre to centre. These grooves, which are about one inch wide 

 at the top, run diagonally towards the gutter and help to prevent 

 slipping. The race and gutter have a longitudinal slope of 1 inch in 

 7 feet, and the surface of the race has a similar cross-slope towards the 

 gutter. The drippings which fall on the race are carried by the gutter 

 to the sump, where solid matter settles while the fluid is returned to 

 the tank through a 4-inch earthenware pipe. 



When dipping is finished the entrance to the sump is closed by 

 an iron plate and the rain water discharge is opened (see Fig. 185). 



The entering race is 2 feet 6 inches wide between the fence rails, and 

 the dripping race is 3 feet wide. 



