The Flow Of Gases In Furnaces

APPENDIX VI

ARCH BRICK WORK

FORMULAS AND TABLES FOR FANTAIL OR TAPER ARCHES
BY A. D. WILLIAMS

TABLES giving the number of shape and straight brick required
to make a complete circle are found in many of the firebrick and
facebrick catalogues. These are very convenient, as far as they
extend, in regard to the standard shapes, but are of comparatively

little assistance in working out
the shapes required for " fan-
tail " or taper arches, which
may be built either of standard
or special shapes as desired,
or for conical or skew arches.
The accompanying tables
were computed to facilitate the
working out of arch shapes,
and it is believed that the
accompanying diagram sup-
plies sufficient information to
FIG. 137. facilitate their use. They have

been carefully computed and

checked, but the writer will be grateful to anyone who will
call his attention to any errors which may have been made in the
tables.

In the diagram the letters and following formulas corre-
spond :

176