244 FARM BUILDINGS IN SOUTH AFRICA 



4" hardwood slip-rails, 3 each 5 feet 6 inches long. 10 18-inch 

 hook and band hinges (with single bands). 6 18-inch hook and 

 band hinges (with double bands). Bolts (for fencing of race), |-inch 

 diameter by 7£ inches long, 45 lbs. Washers to suit above bolts. Nails 

 and screws : — 2 gross screws for roof-flaps, 2£ inches long, No. 12 ; 

 1 gross screws for forms 1^ inch long, No. 10 ; 3 gross screws for hoop 

 iron guides on forms, f inch long, No. 8 ; 7 lbs. 4-inch nails ; 7 lbs. 

 3-inch nails. 5 2-feet lengths of earthenware pipe, 4 inches internal 

 diameter. 10 gallons coal tar (for rails of race and splash-board rail). 

 100 feet heavy hoop iron. 



The cost of the above-mentioned materials, exclusive of sand and 

 broken stone, at the coast, will be about £77. 



This is allowing for the purchase of jarrah posts and of deal-rails 

 for the race. Excluding the cost of these two items, the total is about 

 £55. The first cost may be further reduced if the farmer is content 

 with flag-stones for the race. 



For the higher price, materials for a first-class job may be purchased. 



Cattle Dipping Tank in Plain Concrete. — Fig. 190 illustrates a dipping 

 tank, in plain concrete, the internal dimensions and shape of which differ 

 slightly from those of the tank just described. 



The walls and bottom of this tank are 9 inches thick, and the former 

 are strengthened by 9-inch piers or buttresses spaced 8 feet apart. 



When the excavation is made, a series of vertical cuts, in the sides 

 thereof, must be excavated for the purpose of forming the buttresses. 



The tank will be rendered safer against transverse cracking if it be 

 semi-reinforced, say by barbed wire or round iron bars. The inside of 

 the tank may be plastered with 1 : 2 cement mortar applied in a layer 

 £-inch thick. 



Other Materials of Construction. — Other materials of which cattle 

 dipping tanks may be built are : — 



(1) Stone in blue lime, pointed with 1 : 2 cement mortar ; 



(2) Hard burned bricks, rendered with 1 : 2 cement mortar on the 



inner face of the tank. 





