In
order to form the casings, the concrete is moulded in the form of slabs.
Figs. 1 to 18 of our engravings show various forms of the slab, which
may be manufactured with a surface of any dimensions and of rectangular
(Fig. 1), triangular, hexagonal (Figs. 2, 14, and 15), and indeed of any
other form that will make a complete surface, while for thickness it may
be suited to the work to which it is to be applied, that used for heavy
engineering work differing from that employed in house construction. It
is found that the most convenient height for the rectangular slab (Fig.
1) is 12 inches and the breadth 18 inches, as the parts of a structure
built with slabs of these dimensions more often correspond with
architectural measurements. The hexagonal slab (Fig. 2) is made to
measure 12 inches between its parallel sides. Where combinations of
these slabs will not coincide with given dimensions, portions of slabs
are moulded to supply the deficiency. The moulds in which the slabs are
made are simple frames with linings having a thin face of India-rubber
or other suitable material, by the use of which slabs with their edges
as shown, and also of the greatest accuracy, can be manufactured. That
portion of the back of the slab which is undercut is formed by means of
soft India-rubber cores.
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