MAK

Volltext: Ceramic art : a report on pottery, porcelain, tiles, terracotta and brick, with a table of marks and monograms ...

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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