TERRA-COTTA, BRICK, ETC.
121
Table showing the Percentage of Water absorbed by vcivious Pt iclis
after Thirteen Days’ submersion.
Degree
of Burning.
Locality of Clay.
The Process of Manu-
facture.
N S)
s°s
« = •§
o CS CO
tio’S
ß o to
1 Hard, . .
2 Dark, . .
Light, . .
Salmon, .
Very hard,
6
7
8
9
10
11
12
13
11
15
16
17
18
19
20
Dark, .
Salmon,
Dark, .
Dark, .
Light, .
Salmon,
Salmon,
Light, .
Hard, .
Salmon,
Light, .
Hard, .
Hard, .
Dark, .
Light, .
Pea Shore, N. J., •
Hestonville, Pkila.,
Neck, Phila., .
Hudson R., N. Y.,
Chambers’ machine,
Hyd. Press, 600 tons
pressure,
Dry Press,
Dry Press,t
Chambers’ machine,
Hand,
Hall’s machine,
5 0 5 2
4 15 5 7
4 14 5 10
4 14 5 12
2 4
4 13
2 8
4 10
4 12
4 8
4 13
4 11
4 10
2 6
5 7
3 1
5 15
6 3
6 0
6 8
o
5
5
5
5
5
5 3
4 6
4 12
2.5
10.12
15.4
17.95
*5.55
13.
22.5
14.46
16.47
15.66
18.18
22.22
18.91
15.78
20.83
15.58
9.33
12.16
4.47
15.15
* This brick, in the process of manufacture, was submitted to a pressure under a hydrau-
lic press of 121,695 pounds to the sipiare inch.
f This brick was made by the dry-day process, of the »ame clay as No. 1, and was ezposed
one Winter to the action of the frost, and had partially fallen, none of the angles being left.
This shows a gain in weight of from two to sixteen
ounces, or from per Cent, to 221 pe r cent.
The capillary power of hricks is such that even if made
hollow in the liest rnanner, the inner surface must become
as fully saturated with water as the outer; and there is no
remedy except to protect the outer surface by an imper-
vious ghize, or enaniel, or to thoroughly isolate the inside
wall, or layer, from contact with the outer. Even headers,
or tie-bricks, at intervals, seive to convey the moisture and
destroy the efficacy of a hollow wall.
Sizes of Bricks.
There was a variety of sizes of bricks shown at Vienna.
In general, they ure broad and not thick. Iii the United
States there is no Standard size. In the Eastern States
bricks are short, narrow, and very thick. The bitter make a
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