SHEEP DIPPING TANKS 259 



dipping tank and yards are reproduced in Fig. 202. The tank is built 

 of concrete. 



Graduating a Tank for Capacity. — A simple method of ascertaining 

 the capacity of a sheep dipping tank is to measure water into it through 

 a vessel of known capacity. First fill the dipping tank to a depth of 

 2 feet 6 inches, which is just sufficient to float a sheep, and make a 

 permanent mark on the wall of the tank of the number of gallons 

 required to do this. Then add water, 50 gallons at a time, and mark 

 each 50 gallon level on the wall of the tank. A staff, similarly marked 

 should be kept, in case of the graduations on the wall of the tank 

 becoming obliterated. 



In case water is added by weight, it should be remembered that 

 1 Imperial gallon of water weighs 10 lbs , hence 50 gallons will weigh 

 500 lbs. 



