APPENDIX 

 LINING UP SHAFTING. 



185 



Fasten a heavily chalked string along the ceiling paral- 

 lel to the direction the shafting is to take. Snap the 

 string, and a white mark will indicate the position of the 

 shafting in a plane parallel to the floor. This plane is 

 indicated by the line ab in Fig. 66. Next determine the 

 position of the shafting in a plane at right angles to the 



G 



e 



Fig. 66.— Intersecfting Planes. 



Fig. 67.— An Aid to Lin- 

 ing up Shafting. 



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 shaft- 

 ing, at intervals of three feet, pieces of board like that 

 shown in Fig. 67. The upper end is rounded to fit over 

 the shaft, while the lower end is perforated as indicated 

 in the Fig. -These. pieces of board must be carefully cut 



