30
stones have roughly dressed level
beds and
set in mortar
derably hydraulic, that is to
з не?
...
sany
the mortar would have been per - felly hydraulic had there been less sand in it. In the Praga Cast-
all the headers
while
"chrough" clones,
a^l
the best
only
one
them extend the whole
of
the wall,
but even
this feature
/
the strengths of
Section
of
half of
thickness
in the latter
༧༥
Covely enha
the structive
Brods
which is
given
in photo-
длядов на св
The thickness of thes
courses varies prom 19 to 15 inches
but the exping
Cour sk
is
Gule
18 inches thick and consists of
Covering stones about four feet square cxtending back the full depth of
the
wall.
4
SHEWING
CHARACTER OF
MASONRY
PROPOSED TO BACK WITH
CONCRETE.
ÖN
PHOTO