TABLE XXXIX. 



Snows THE SUPERFICIAL CONTENT OF SLATER, TILER, OR THATCHER 



WORK, PAVING, ETC., FROM 1 INCH TO 50 FEET BROAD, AND FROM 

 J OF A FOOT TO 100 FEET IN LENGTH, IN SQUARE YARDS, FEET, AND 

 INCHES. 



THE lengths are found in the left-hand column of each page ; 

 the breadths are placed along the tops of the other columns in the 

 Table; under any of which, and opposite any given length in the 

 left-hand column, stands the superficial content in square yards, 

 feet, and inches. 



NOTE. The square yard contains 9 square feet, the foot is 1 

 foot long and 1 foot broad, and the inch is j 1 ^ of a square foot ; 

 thus, in adding together two or more contents, 1 for every 12 

 inches must be carried to the feet column, and 1 for every 9 feet 

 to the yards column. If the length sought exceed 40 feet, and is 

 not to be found in the Table, any length up to 140 feet may be 

 got by the combination of two lengths ; for example, a length of 

 69 feet may be got by taking 40 and 29, or more conveniently 

 by taking 34 and 35 ; 88, by 70 and 18 ; 135, by 100 and 35, &c. 

 In like manner, any breadth above 25 feet up to 75 feet may be 

 found by a combination of two breadths ; the contents of the two 

 lengths or breadths added together, give the content of the 

 measurement sought. 



To measure the roofs of houses, add the breadths of the two 

 sides together, and with the sum of the two, by the length, the 

 content may be found at once ; or, if more convenient for calcu- 

 lation, each side may be taken separately, and the contents of the 

 two added together ; or, when both sides of the roof are the same 

 in breadth, the breadth of one side may be taken at twice the 

 length. Allowance is made for the double row of slates at the 

 eaves, by bringing the measuring tape over the edg of the slates 

 to the wall. 



EXAMPLES. 



1. What is the superficial content of the roof of a house, the 

 length of which is 39 feet, the breadth of one side of the roof is 

 14 feet, and the breadth of the other side 16 feet? 



First add the breadths of the two sides of the roof 14 -j- 16 

 = 30 feet, breadth of both sides ; then under 30 feet, and oppo- 

 site 39 feet, the length, stands 130 square yards, the content. 



