BRICK :‘,1 A SONRY. \\*if 11 dlle :1 loW:11WP made for the difference of the material and the dif ference in the dimensions of the blocks used. brick masonry corresponds very closely to dressed dimension ,tone range ashlar masonry. Iy. The bond Used is varied considerably, but is usually either the English bowl or the Flemish bond. In the Entllsb bond the courses are alternately head• PT+ and ctreteliers. and in the Flemish bond the brink in each course are alternately headers and stretchers. (For further description and illus trations of brick masonry, see ',DING.) The mortar used in brickwork may be either lime mortar or evinent mortar, the former being most used in ordinary building work. Practice varies in the amount of pressure allowed upon brick masonry, but it should carry safely a load of 20 tons per square foot when laid in Iiinc mortar. Brick masonry is chiefly used in building con struction and in lining tunnels and construeting sewers. Compared with stone masonry, brick masonry is not so strong as ashlar masonry, but it costs less. while it is stronger than rubble masonry, but costs more: it resists tire better and is at least enually as durable against ordi nary weathering as best stone masonry.
CoNcaKyr.: :MASONRY. CODell'h• masonry inay consist of molded blocks of concrete laid like ashlar or squared stone masonry or of monolithic masses of concrete deposited or constructed in situ. In the first class of work the plastic con crete (see CoxcREYE) is rammed into suitable molds and allowed to harden. and then the hard ened blocks arc laid in the structure just as similar blocks of natural stone would be laid. In the second class of work the plastic concrete is deposited directly in the position it is to oc cupy in the finished structure, molds being used to confine the material to particular forms and positions When necessary. Collerete Masonry iv extensively Used for nearly all the purposes for which brick and stone are now employed. For a voinpreliensive treatise on masonry work, con sult: Laker, Trtalise on Masonry ('oilstreclftm (New York, 19p01 ; Stones for Building Decoraliwt (New York, IS9 1 ). See BUILD ING; 13UILDING-STON ; BRICK; CEMENT; CON CRETE ; .:MORTAR: QUARRY ; STONE AND DREsS I NG ; :Old STONE, ..\IrrivicIAL.