. The Practical brick and tile book. om-pression, mould the bricks from clay perfectly commi-nuted, but either dry, or at most only very slightlymoistened. One of the most salient advantages of thedry method is, that it produces a denser brick, and onethat shrinks less both in drying and in baking thando those made wet; and that a certain amount, thoughnot a very great one, of the labour and cost of the 212 RCDliLENTS OF THE pelimmary preparation of the clay is saved. Thedisadvantages, or some of them, are, that miless theclay in the dry or merely damp state be scrupulouslywell prepared, and u
. The Practical brick and tile book. om-pression, mould the bricks from clay perfectly commi-nuted, but either dry, or at most only very slightlymoistened. One of the most salient advantages of thedry method is, that it produces a denser brick, and onethat shrinks less both in drying and in baking thando those made wet; and that a certain amount, thoughnot a very great one, of the labour and cost of the 212 RCDliLENTS OF THE pelimmary preparation of the clay is saved. Thedisadvantages, or some of them, are, that miless theclay in the dry or merely damp state be scrupulouslywell prepared, and unless a degree of pressure beemployed which demands a good deal of power, thebrick may be deficient in tenacity and in uniformsolidity, or even in perfect fairness of face. On theother hand, with certain clays, and pressures beyond agiven point, bricks are thus produced, which, thoughdense and resistant, have so ?/;«porous a surface ashardly to take bond with either cement or 1 represents Whiteheads Improved Clay Crush-. ing and Grinding Roller Mill, consisting of two pairs oflarge iron rollers, fitted in a massive cast-iron dimensions of the top rollers (which revolve at equalspeed) are 2 ft. 6 in. long by 1 ft. 8 in. diameter. Thelower pair (running as two to one, fur more thoroughlyincorporating the clay) are 2 ft. 6 in. long by 1 ft. 6 in. ART OF MAKING BRICKS AND TILES. 213 diameter. The above mill is constructed for the pur-pose of reducing rough strong clays or hard marls notdisintegrable by water, into a state to be rendered plasticby future operations in the pug-mill, of which two dif-
Size: 1746px × 1431px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbr, booksubjectbricks
