USEFUL TABLES. 249 



piston, and making 100 strokes of 2 feet each per minute, is 10 

 horse-power (or 30X55X100X2=330,000 ~ 33,000=10). 



QUANTITY AND WEIGHT OF WATER IN SIX FEET OF PIPE OF 



i inch diameter ............... 0.5 0.06 



1 .............. . 2.05 0.24 



1J " .......... ..... 4.60 0.54 



2 " " ............... 8.18 0.96 



3 " " ............... 18.41 2.16 



4 " " ....... ^ ....... 32.72 3.84 



(For double the diameter multiply contents 4 times.) 



One barrel of cement and two barrels of sand will make mortar 

 sufficient for 600 to 700 bricks. 



One barrel of cement to 4 of sand and gravel will make 9 square 

 yards of concrete floor 3 inches thick. 



A barrel of lime with 10 bushels of sand will make mortar for 

 1,000 bricks. 



A barrel of lime and 10 bushels of sand will make plaster for 40 

 square yards of surface; half a bushel of long hair, or a half more 

 of short hair, will be required. 



One hundred laths and 500 nails will cover 4| square yards. 



A hod of mortar is half a bushel. 



A square yard of plastering requires three-fourths of a bushel. 



Twenty-three and one-half cubic feet of sand, 17^ of clay or 18 of 

 gravel weigh one ton. 



A cubic yard of solid ground equals 1J cubic yards when dug. 



CONTENTS OF A ROUND CISTERN IN GALLONS AND NUMBER OF BRICKS 

 REQUIRED FOR EACH FOOT IN DEPTH. 



GALLONS. BARRELS. BRICKS. 



8 feet diameter 

 8J " " 



9 " 

 9J " " 



10 " 



11 " " 



12 " " 



13 " " 



15 



