Mechanical exercises, or, The elements and practice of carpentry, joinery, bricklaying, masonry, slating, plastering, painting, smithing, and turning . F,\^. ^,/J^::/,,,,7fr?M^7^iMi^7hr. •M BRICKLAYING. 251 PLATE VII. The method of cutting the bricks for a cylin-dro cjlindric arch, and two different methods forthe joints of the heads of niches. Fig. 1 the cjlindro-cylindric arch, with a frameof wood so constructed, that the two horizontalpieces having their outer edges in circles con-centric with the circle of the wall: this is shownby the plan of the wall No. 2. The
Mechanical exercises, or, The elements and practice of carpentry, joinery, bricklaying, masonry, slating, plastering, painting, smithing, and turning . F,\^. ^,/J^::/,,,,7fr?M^7^iMi^7hr. •M BRICKLAYING. 251 PLATE VII. The method of cutting the bricks for a cylin-dro cjlindric arch, and two different methods forthe joints of the heads of niches. Fig. 1 the cjlindro-cylindric arch, with a frameof wood so constructed, that the two horizontalpieces having their outer edges in circles con-centric with the circle of the wall: this is shownby the plan of the wall No. 2. The edges of thecircular pieces are graduated with divisions per-pendicularity over each other, A B: No. 2 is arule to be moved vertically along the said con-centric edges, which vertical position is alwaysknown by the corresponding divisions, on thefront edge of the rule is a hook projecting so asto come to the cylindric surface of the wall, thehook is shown at No. 3, with a part of th6 use of this machine is for drawing the edgesof the bricks in order to cut them to the circle. Fig. 2 two different methods of forming thejoints for the heads of
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Keywords: ., bookcentury1800, books, booksubjectcarpentry, booksubjectgeometry
