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that is, the solid part of 1 is placed over the joint formed by the juxtaposition of the bricks a and c. In ordinary work, bricks are used in two ways—as 'headers1 and 'stretchers1—the 'headers' being placed across the wall, the ' stretchers' running along in the direction of its length. Thus, in Example 53, fig. 53, suppose ab to be the line of wall, the bricks ccc are ' stretchers,' and d a ' header.' The size of a brick of the ordinary dimensions is 9 inches long, inches wide, and 3 inches thick. Brickwork is generally laid in two kinds of bond, termed 'English' and 'Flemish' bond. By the term ' bond' is meant the tie between the various members of a brick wall, and which is generally secured by the proper disposition of the bricks; this is effected by the arrangement of the ' headers' and ' stretchers.' Thus, in

Example 54, fig. 54, which is a specimen of an elevation of a brick wall in English, or as it is sometimes termed, old English bond, where it con-

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