STANDARD WEIGHTS AND MEASURES 549 



Each nominal horsepower of a boiler requires thirty to thirty- 

 five pounds of water per hour. 



Studding. — Estimate the number of lineal feet of partitions 

 and outside walls and allow one stud for each foot. If set to the 

 customary sixteen-inch centers, this will give the extra studs 

 necessary for doubling- up around doors and windows. 



Covering capacity of shingles. — Shingles of the average size 

 of four by sixteen inches are taken as a basis of calculation : 



100 square feet will require laid 4 inches to the weather. . . 900 

 100 square feet will require laid 4*4 inches to the weather. . . 800 

 100 square feet will require laid 5 inches to the weather. . . 720 



One thousand shingles require three and one-half pounds of 

 four-penny nails. 



Five to ten per cent should be allowed to these figures to cover 

 waste and shortage. 



On estimating flooring and ceiling boards the following should 

 be allowed for matching: One-third for boards of three-inch 

 width ; oii,e-quarter more for boards of four-inch width ; and one- 

 fifth for boards of six-inch width. 



For beveled siding make no allowance for openings and add 

 one-quarter more for four-inch and one-sixth for six-inch. 



POST-OFFICE REGULATIONS — DOMESTIC 



In addition to the States and Territories, domestic rates apply 

 to the Island Possessions, the Panama Canal Zone, and Shang- 

 hai, China. 



