The commonest method of building monolithic walls of concrete is to
use wooden forms. These are built in sets of panels, one for the
exterior and the other for the interior face of each course. These are
successively raised, one above the other, in pouring the walls. Mr.
Ernest Flagg, architect, has developed a remarkably simple system of
concrete-wall construction with the wooden form. Roughly broken stone
are set against the inside of the forms, used for the exterior face of
the wall, and the rest of the wall is filled up with concrete. By
raising the boards which are used for the forms, as each layer hardens,
the wall can be erected without skilled labor and yet have the
appearance, on the exterior, of a stone wall. Of course it is necessary
to point the joints of the stone work after the forms have been removed.
[Illustration: 22. Typical monolithic wall construction