CREAMERY BUTTER MAKING 199 



shafting in a plane at right angles to the floor. This 

 plane is indicated by the line ab in Fig. 61. Next 

 determine the position of the shafting in a plane parallel 

 to the floor, indicated by the line cd. This is done as 

 follows : Loosely fasten the hangers along the white 

 chalk line and properly fasten the shafting. Now hang 

 on the shafting, at intervals of three feet, pieces of board 

 like that shown in Fig. 62. The upper end is rounded 

 to fit over the shaft, while the lower end is perforated 

 as indicated by the dot. These pieces of board must be 

 carefully cut so that the distance P is the same in all. 

 If the holes at the lower ends are all in line the shafting 

 is properly lined up. If not, the shaft needs readjusting. 



