Arches over doors and other internal openings may be flat rough cut, or axed arches, containing wooden plugs, ppp, as in Fig. 101; or a wood lintel may be placed over the opening, with a rough segmental relieving arch, similar to that in Fig. 99, the gauged arch shown in that figure being, of course, omitted. Of these constructions the last mentioned is commonly adopted. The use of rough - axed arches is not common, but it is advocated on the ground that they do away with the wood lintel, which is liable to destruction by fire or decay, and to become loose by shrinking. Lintels of concrete, as described at page 11, may be used, and have the same advantages as flat arches.
Rough axed Arch with Plugs.