Up: 3-Way Prism
Catalog 14-S
5 of 18
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Locked, as the glass is, in a solid mass of
concrete and steel, it requires the most severe kind
of accident to break the tiles. With the edges of
the tiles beveled, the cement finish is worked up
well over the bevel, thus holding the Plastic
Malleable coating in place. No chance for the
expansion of the concrete and the glass to squeeze
this out and thus leave and unprotected edge on the
tile to be chipped by nails in heels; nor to open the
seam and make the installation leaky. |
Concrete does not
adhere to iron or steel if they have been finished
with any kind of coating but this is of no
disadvantage in the Paschall construction. The
concrete is worked down around the glass and into
the groove of the I bar and the entire top of the
bars are covered, flush with the top of the glass.
Thus the three members of the construction -- the
steel frame, the glass tiles and the concrete are
all moulded into one mass, locked and interlocked
by the steel I bar.
In this way only, is it
possible to secure such a large proportion of glass
to frame as has the Paschall System. And as a slab
of reinforced concrete construction it has the great
strength and smooth walking surface required for
sidewalks. On the underside, the showing is entirely
coated steel and glass. This gives the maximum of
glass diffusion surface -- hence more light.
Plastic Malleable Coating
The chief fault of glass
sidewalk construction has been the breaking of the
glass due to the unequal expansion and contraction
of the glass, metal and concrete. In the Paschall
(as well as our other constructions) we have provided
for this danger by protecting each glass tile with an
expansion cushion to absorb the excess pressure of
the concrete and thus save the glass. This cushion
is made of our Plastic Malleable Coating and is found
in all our glass.
By means of our patented form
this cushion or coating is countersunk, so that when
pressure is exerted by expansion the coating is not
squeezed out. The joints are waterproof if properly
caulked, and it should not be necessary to recaulk
for many years. |
Easy To Install
With the metal work supplied
in a complete grid, ready to set in place, and the seat
of each glass tile ready for simply slipping it into
place, any experienced sidewalk man can, by following
our blue-prints, and with our simple directions, easily
install the Paschall Sidewalk Lights. For the full
description of our patented expansion joint that
absolutely prevents leakage without the necessity of
continued caulking, see page 15.
By increasing the weight of the steel I bars, we can
span any reasonable width without the use of
light-obstructing supporting beams. The average
weight, set in place, complete, is about 25 pounds per
square foot.
Architects specifications and
details of construction on page 7.
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