113
Discarding sands as natierally inert
and seeking
ingredient that woulds
exercises upon the lines, influencer
similar to that
Ú H
the brass of Ger-
made
of the many
puzzolana of Staty a second set of experiments was with the red clay of Kowloon as highly ferruginous silicato
containing but littler or
lime, magnesia,
or potash.
there the mortars were
of
alu-
found, to
2.0
w
have set in three weeks but at this
end of five months they
sufficiently good.
hard or
seatrive
trie for
LOCAL
not
lough to make
for concrete. Du
the year following having had oc- casion to best some limes imported from the lime stone region above
the della
the Canton River, but
which
which
are not
generally
met with in
commerce here, owing to the local
shell lime being
so much easier.
and cheaper to get, a third set of
experiments
wwe made with the some
ferruginous clay,
a markeds improve
owing
doubtless
ment being the result to the original presence of clay in the stove time. Betting
occurred) un-
der water in his days, the mortar
requiring great tenacity already in
the third mouth. This result was
sufficiently satisfactory to justify the erection of
A
small dea
of the below lands in
wall
Juas V in the
proportions of of parts broken stoner to 1 of ferriginous clay
of
the lime and the structure has cons
tinned to hardens under water in