TABLE XV. 



SHOWING THE LENGTH OF DRAINS IN AX IMPERIAL ACRE, AT DISTANCES 

 FROM 9 TO 63 FEET APART, IN YARDS, IN STATUTE RODS OF 5j 

 YARDS, AND IN ROODS OF 6 YARDS I ALSO THE NUMBER OF DRAINING 

 TILKS OR PIPES THAT ARE REQUIRED TO LAY THE DRAINS, AT 

 LENGTHS OF 12, 13, 14, 15, 10, AND 18 INCHES. 



THE first column on tho left hand contains the distances or 

 widths between the drains ; the second contains the length of 

 drains per acre, in yards ; the third the number of rods per acre ; 

 the fourth the number of roods per acre ; and the fifth to the 

 tenth columns contain the number of tiles of each length, required 

 for an acre, at the opposite widths in the left-hand column. 



In the Table, fractions less than J of a foot are omitted in the 

 second column, and when less than J of a yard, in the third and 

 fourth. 



Drains in some parts of the country are measured by the rood 

 of 36 yards in length, and in other parts by the chain of 66 feet ; 

 hut statute rods ot'Sj yards, and roods of 6 yards in length, being 

 most generally used, the Table is calculated at these lengths. 

 The rood of 36 yards is equal to 6 roods of this Table, and the 

 chain of 66 feet is equal to 3| roods. 



It will be observed that the length of the drains, and the num- 

 ber of tiles required per acre, is in proportion to the width between 

 the drains ; therefore if a width twice that of any in the Table is 

 wanted, you have only to divide the numbers in the columns 

 opposite that width by 2, the quotients will give the length of 

 drains and number of tiles required. 



To find the expense of draining per acre, multiply the number 

 of yards, rods, or roods, opposite the proposed width between the 

 drains in the Table, by the estimated cost per yard, rod, or rood, 

 as the case may be. 



EXAMPLE I. It is proposed to drain a field, placing the drains 30 feet apart, 

 required the length of drains per Imperial acre in yards and roods, and the 

 number of tiles 14 inches in length that will be needed per acre. 



Look in the left-hand column of the Table for 30 feet, the width, opposite 

 which stands 484 yards, or 80 roods 4 yards, the length of the drains, and 

 under length 14 inches stands 12 to, the number of tiles required to lay 

 the same. 



EXAMPLE II. In draining a field at a width of 80 feet, how many yard?, 

 and how many rods of drains are there per Imperial acre, and what number 

 of tiles 15 inches in length will be required per acre ? 



As the Table does not extend to 80 feet, divide the numbers opposite 40 

 feet by 2, which gives 181 yards, or 33 rods of drains, and 436 tiles 15 inches 

 in length per Imperial acre. 



EXAMPLE III. Required the expense of draining per acre, at a width he- 



