TABLE XXXIX. SUPERFICIAL MEASURE. 529 



2. What is the superficial content of a roof 52 feet long, and 

 each side 20 feet broad? 



Add the lengths of the two sides together 52 + 52 = 104. feet, 

 and as this length is not in the Table, we must find the 

 content at 100 feet and 4: feet separately, and 

 add them together; thus, opposite 100 feet, and Sq.Yds. Ft. 

 under 20, stands . . . . 222 2 



And opposite 4. feet stands , . 88 



The content, . . 231 1 



To measure the thatching of oblong stacks; proceed as directed 

 for the roofs of houses. 



To measure the thatching of circular stacks, consider the cir- 

 cumference of the stack at the eaves as the length, and half the 

 slant height from the eaves to the top of the stack as the breadth ; 

 or, half the circumference at the eaves as the length, and the 

 whole of the slant height as the breadth; by either method the 

 superficial content is found by the Table. 



3. Required the superficial content of the thatching of a 

 circular stack, the circumference at the eaves being 58 feet, and 

 the slant height 12 feet? 



If we consider 58 feet as the length, and half the slant height 

 = 6 as the breadth, then as 58 is not in the Table, we 

 may take 40 and 18, or twice 29, and add the 

 contents together, thus, opposite 29, and under Sq.Yds. Ft. 

 feet, stands . . . . . . . 19 3 



Which multiplied by ... 2 



Giyos the content of the thatching, . . . 38 6 



If we had considered the half of 58 feet = 29 the length, and 

 the whole slant height as the breadth; then, opposite 29, and 

 I under 12 feet, the breadth, stands 33 square yards, 6 feet, the 

 content, as by the former method. 



Roofing, paving, and mason- work being sometimes calculated 

 by the rood of 36 square yards, the number of roods in any 

 measurement may be found by dividing the content in square 

 yards, as found by this Table, by 36. 



EXAMPLES. 



1. How many roods of slating are in a roof measuring 130 

 square yards? 



36 ) 130 ( 3 roods 22 yards. 

 108 



22 



2L 



