Morris tribune., 1897-07-07
TERRA GOTTA.
Ehe MatsaiaI Grows In Usefulness In the
Builders Hands.

Oo~AeAAAAND0
Builders Hands.
Terra Gotta has been described as
the great and only lasting triumph
of man over natural productions,
for it will last longer than iron,
stope, wood and all other materials
that will succumb to fire and other
destroying influences. Because it
predominates in that respect and be-
cause it can be used for the protec.
Ion of iron and steel, and the en-
richment Of brickwcrk and stone.
work of various designs, it is used
extensively in these days Of lofty
buildings and artistic and elaborate
ornamentation.
Taking into consideration only
architectural terra Gotta, the prod
uct is immense, and, as the process
of production is interesting, it may
be worth while to describe sumo
parts of the industry that has in
creased SO rapidly. Decorative and
artistic qualities are employed in
the productions, and good results
cannot be obtained without careful
attention, technical skill and ex-
haustive experiments. The compost
ton of clay and the effect of heat
must be known, and the combina-
tons of certain colors must be de-
termined before the plastic mass
can be nodded and fired. The colors
of clays in the pits do not determine
the colors of the finished product.
A very dark clay may be white aft
er it has been in kiln, and a red
clay may be redder. Some clays can
not be used alone for terra Gotta.
They require a mixture with other
clays, and the requisite quantities
of clays for proper production are
kept secret in the business because
the proportions have been ascer-
tanned after many failures. The
combinations of clays and the re-
suits of firing having been deter
mined, architects and builders take
the product and employ it to the
best advantage for interior or ex-
terror work.
Sample blocks of terra Gotta are
furnished by the makers to the
architects, and after the selection of
any particular tint tons of the ma
terial with the same tint can be
produced. From an architect S draw
ings the craftsmen at the terra cot
ia works copy the parts that are in
Dictated for the use of terra Gotta
and develop working drawings for
the modelers and moldmakers.
Some architects furnish their own
working drawing, with each detail
indicated. Others suggest what they
want, permit the artists and drafts
men to elaborate the ideas and APP
prove the results after photographs
and blue prints of the models and
drawings have been submitted It
is very often the case that the mod
elers have more talent than the ar
chitects for producing decorative
effect in terra Gotta, because certain
limitations must be considered. The
craftsmen also understand by e1-
perience how to place the support
ing partitions of the hollow pieces.
In a few instances architects have
indicated large pieces of the mate
rial that could not be produced by
the present process. tits difficult to
make and handle very large piece
from single design, but almost any
design can be reproduced by max
ing the piece in parts and joining
them together. The weight of, the
clay in a large piece is often too
great for its tenacity. During the
drying the tenacity of the clay
should enable the piece to move or
travel, as the workmen say, in pro-
portion to the shrinkage.-N
York Times.