44 



WOOD-USING INDUSTRIES 



the supply of the cypress was imported from South Carolina and 

 Florida. 



TABLE 7. SASH. DOORS, BLINDS, AND GENERAL MILL WORK. 



WOOD-PAVING BLOCKS AND CONDUITS 



The articles belonging to this industry are used for municipal 

 improvements. Conduits are used in underground construction for 

 the distribution of electric power and telephone service. .The terra 

 cotta conduits have until within recent years met the entire demand 

 as wood ducts were not practical owing to their being subject to decay 

 when in contact with the ground. The development of successful 

 methods for the prevention of decay by impregnation of the wood with 

 creosote and other antiseptic solutions has increased the life of woods 

 as much as double its natural life. This has led to the adoption of 

 wood conduits. The demand for them is growing, and owing to 

 their being more moderate in price, lighter in weight, more economical 

 to lay, and less liable to break, they have entered into active competi- 

 tion with the clay conduit. The underground telegraph line recently 

 completed from Boston to Washington, D. C., at a cost of three and 

 one-quarter million dollars is laid in wood ducts the entire distance. 



