TABLE XVII. 



SHCMVG THE NUMBER OF TILES OR PIPES OP 12, 13, 14, 15, Ifl, 

 AND 18 INCHES IN LENGTH, THAT ARE REQUIRED TO LAY ANY LENGTH 

 OF DRAINS, FROM 1 TO 5000 STATUTE RODS OF 5j YARDS, AND 1 

 TO 5000 ROODS OF 6 YARDS; ALSO THE NUMBER REQUIRED TO LAY 

 FROM 1 TO 30,000 YARDS. 



THE first and second pages of the Table are occupied with the 

 number of tiles required for statute rods, and for the same 

 lengths in yards ; the third and fourth pages contain the number 

 required for roods of 6 yards, and for the same lengths in yards. 



In the first and second pages, the first column on the left hand 

 contains the length of drains in statute rods ; the first column 

 of the third and fourth pages contains the length of drains in 

 roods of 6 yards; the second column contains the length of drains 

 in yards ; and columns 3 to 8 contain the number of tiles of each 

 length required to lay the number of rods, roods, and yards of 

 drains in the first and second columns. 



As there is no allowance made for waste and breakage of tiles, 

 3 or 4 per 100 may be added to the number given in the Table. 



Where fractions occur in the calculation they are reckoned 1 . 



EXAMPLES. 1. How many tiles, 14 inches long, are required 

 to lay 653 statute rods of drains? 



Find 600 in the second page of the Table under rods, 



opposite which, under 14 inches, stands . . 8488 



And opposite 53 rods stands .... 750 



9236 



Add for breakage, say 4 per 100 . . . . 369 



Number of tiles required, 9005 



2. How many 15 inch-pipes are required to lay 549 roods of 

 drains, each 6 yards in length? 



In the fourth page of the Table, opposite 500 roods, 



under 15 inches, stands 7200 



And opposite 49 roods stands .... 706 



7906 



Add for breakage three per 100 .... 237 

 Number of pipes required, 8143 



3. How many tiles, 13 inches long, are required to lay 5720 

 yards of drains? 



In the second page of the Table, under yards, is found 



5500, opposite which, under 13 inches, stands . 15231 

 And opposite 220 stands . . . . . 610 



15841 

 Add for waste, three per 100 



Number of tiles required, 16316 



