TABLE XLI. 



SHOWS THE NUMBER OF BRICKS OF THREE DIFFERENT SIZES, REQUIRED 

 FOR A WALL OR BUILDING, AT SIX VARIOUS THICKNESSES ; AND AT 

 CONTENTS FROM YARD TO 200 SUPERFICIAL OR SQUARE YARDS. 



THE Table is divided into 7 columns ; in the first column, on 

 the left, is the content in square yards ; on the tops of the other 

 six columns the various thicknesses are placed in their order; under 

 any of which, opposite any given content, is found the number of 

 bricks that will be required for a building of the given thickness 

 and content. 



By adding together the number of bricks of two or more con- 

 tents in the Table, the number required for a building of any 

 extent will be found. 



Standard bricks are supposed to measure 9 inches in length, 

 4J inches in breadth, and 2| inches in thickness. But during 

 the time that an excise duty of 65. \\d. per 1000 bricks (now 

 abolished), was charged on all bricks that did not exceed 150 

 cubic inches before being burned, some manufacturers, while study- 

 ing that their bricks should not exceed the legal size when green, 

 endeavoured to turn them out as large as possible after being 

 burned. The consequence was, that in different brick-works, 

 from the manner of the manufacture, the quality of the material, 

 and the different forms of the moulds, bricks, after being burned, 

 varied from the above mentioned size up to 9f inches long, 4f 

 inches broad, and 3f inches thick. 



Of the standard bricks about 4500 are required for an English 

 rod, and 5400 for a Scotch rood, standard thickness ; of the medium 

 size, about 4050 are required for an English rod, and 4860 for a 

 Scotch rood ; and of the largest size, about 3600 are required for 

 an English rod, and 4320 for a Scotch rood. The first page of 

 the Table, or No. 1, shows the number required of standard bricks ; 

 the second page, or No. 2, the number required of medium sized 

 bricks ; and the third page, or No. 3, the number required of the 

 largest sized bricks, for each content in the left hand column. 



In Scotland, brick-work is generally calculated by the square 

 yard, or by the rood of 36 square yards ; in England it is usually 

 calculated by the square rod of 30 J square yards, equal to 272| 

 square feet ; but, as the fraction is troublesome in practice, 272 

 square feet is reckoned a rod. Brick and half thick, or making 



