312 FARM BUILDINGS IN SOUTH AFKIGA 



As in the silo, the vertical rods, other than those in the buttresses, shown 

 in the drawings, may be regarded as stress distribution bars ; any extra strength 

 due to them will increase the factor of safety of the structure. 



Calculation of Graduations Showing Volume of Liquid in a 

 Cattle Dipping Tank at Various Depths. 



Let the whole volume of liquid at any depth be denoted by V ; 



Let the volume of liquid in the swim at that depth be denoted by v ; 



Let the volume of liquid in the outslope at that depth be denoted by v± ; 



Substituting those values for y, q, and I in I., we get — 



6v= (i +2 )( 23 " 75+z ?V 



SV = (0814a: 2 + 12'984a;.+ 47'5)S.z 



V = /(0-844z2 4- 12-984£ + tf-b)dx 



, r 0'844a;3 I2'984z 2 . ._ '. 



V = — 1 - r-47-oz 



there being no constant of integration, because when x = 0, V 



(I) 



