MILL CONSTRUCTION BUILDINGS 



incombustible material at least one and one-half inches thick shall be applied 

 on all floor and roof surfaces above the joists of the same. Wood posts, if 

 used, shall be of not less than one hundred square inches sectional area. 

 Wood girders, if used, shall be of not less than seventy-two square inches 

 sectional area." 



"Definition Mill Construction Requirements. The term "Mill Con- 

 struction" shall apply to all buildings in which wooden posts, if used, have 

 a sectional area of not less than one hundred square inches, and wooden 

 girders and joists a sectional area of not less than seventy-two square inches, 

 and roofs, if of wood, a thickness of not less than two and five-eighths 

 inches in a single layer, and floors, if of wood, a thickness of not less than 

 three and one-half inches in not more than two layers, the lower one of 

 which shall not be less than two and five-eighths inches in thickness, and in 

 which all structural metallic members, if used, are fireproofed as required for 

 fireproof construction, and in which all floors and roofs not constructed as 

 above are of fireproof construction as elsewhere required for fireproof con- 

 struction in this ordinance." 



A Typical New England Mill Construction Plant. 



(Chas. T. Main, Engineer, Boston.) 



Page nine 



