By the use of these slabs the work may be
built up with great rapidity. For small domestic work, such as the
dwellings of artisans, these slabs; which are of such a form as to
render them easy of transport, may be supplied to the workmen themselves
in order that they may erect their own dwellings, as, on account of the
simplicity of this system and the absence of need of plant, any
intelligent mechanic can do the work.
Any arrangement of independent scaffolding may be employed for this
system, but that invented specially for the purpose by Mr. Frank West,
as shown in Fig. 26 of our engravings, is to be preferred. It not only
supplies the necessary scaffold, but also the necessary arrangements for
hoisting the slabs, as well as for raising the liquid concrete and
depositing it behind the slabs. It is really an independent scaffold,
and may be used wherever a light tramway of contractor's rails can be
laid, which in crowded thoroughfares would of necessity be upon a
staging erected over the footway. The under frame is carried upon two
bogie frames running upon the contractor's rail, by which means it is
enabled to turn sharp curves, a guide plate inside the inner rail being
provided at the curves for this purpose. The scaffold itself consists of
a climbing platform made to travel up or down by means of four posts
which have racks attached to their faces, and which are fixed to the
under frame and securely braced to resist racking strains.
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