116 i 



Table 71. Wood for Musical Instruments, year ending June, 1912. 



MACHINERY AND ELECTRICAL APPARATUS. 



The wood used in Pennsylvania for making parts of electrical equipment 

 is represented by Table 72. There are fourteen species required, their prin- 

 cipal uses being: 



Cable Reels. 

 White pine. 

 Shortleaf pine. 

 Hemlock. 

 Red oak. 

 Spruce. 



Wire Spools. 



Sugar maple. 

 Yellow poplar. 

 Basswood. 

 Red oak. 



Insulating Pieces. 

 Sugar maple. 



Rrlaij Boxes. 

 White, pine. 

 Red oak. 



Sw'tch Boards. 

 Mahogany. 



Wire Reels. 

 Hemlock. 

 White pine. 

 Red oak. 

 Yellow poplar. 

 Spruce. 



Electrical CaMnets and Cases. 

 White ash. 

 Walnut. 

 ed oak. 

 Sugar maple. 

 Mahogany. 

 Longleaf pine. 



Trunking. 



Shortleaf pine. 

 White pine. 



Switch Signal Blades. 

 White Dine. 

 White ash. 

 Sugar maple. 



