The moulds for making portions of the slabs
have a contrivance by which their length may be adjusted to suit given
dimensions.
During the process of casting the slabs, and while they are in a plastic
state, mouldings (if required) or other ornaments, having a suitable
key, are inserted in the plastic surface, which is finished off to them
(Figs. 7, 8, and 10). The slabs may also be cast with ornaments, etc.,
complete at one operation (Fig. 11), but it is more economical to have
separate moulds for the mouldings and other ornaments, and separate
moulds for the slabs, and to apply the mouldings, etc., during the
process of casting the slab. Corbels (Fig. 9), sets off (which would be
somewhat similar to the plinth course slab No. 10), and other
constructive features may also be applied in a similar way, or may be
provided for during the casting of the slab. A thin facing of marble or
other ornamental solid or even plastic material may be applied to the
face of the slabs during the process of casting, thus enabling the work
to be finished as it is carried up, or a key may be formed on the face
of the slab to enable the structure to be plastered afterward.
[Illustration: FIG. 19. FIG 20.]
In Fig. 20, the structure from the bottom of the trenches is shown with
the sides of the trenches removed.
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