BRICKS. 255 31 I, and 3 1 4, different pipings of great diameter arc produced (Figs. 312, 313). Hollow bricks are much used for the arches of I -shaped iron floorings (Fig. 316). We see from the figure that the beginning … Figs. 310 to 315. — Hollow Bricks of Special Shapes. of the arch does not fit the shape of the iron on account of the wing ; therefore, to remedy this inconvenience, bricks of special shape are manufactured called "briques à sommier" (Fig. 275). Decoration of Hollow Bricks. — Hollow bricks are…