Ebook The New Metal Worker Pattern Book

Arch-es are usually semicircular (fig. Semi elliptical, segmental, pointed (fig. 7 7 )'or M'oresque (horse shoe) (fig. 7 in shape, according to the style of archi tecture with which they are used. The top of an opening may be perfectly level and yet composed of wedge shaped blocks So combined as to be self -supporting, in which case it is called a flat arch. (fig. 7 9)