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EXPOSITION AT VIENNA.
The clay is found in inexhaustible quantities stratified in beds of the tertiary epoch, ranging from five to sixty feet in thickness. Some of these beds contain fine silicious sand, and others a small portion of lime. Some give light yellow, or cream-stone-colored bricks, and others red colored.
The usual size of the Vienna brick is 11 inches long, 5\- broad, thick, = 290x140x65 millimetres, being considerably larger than ours.
The strength of these bricks has been carefully ascertained by a series of experiments conducted by Professor Rebhau of the Polytechnic Institute, Vienna, and by Prof. J. Bauschinger of the Mechanical-technical Laboratory in Munich.
Resistance of Vienna Brick to breaking strain.
[Experiments by Professor F. Rebhau.]
Breaking with a load of zoll (inch) pounds.
Coefficient of Resistance.
DESCRIPTION OF THE BRICKS.
Kilos per one
square c. m.
Zoll (inch) pounds per one square inch.
Common,
1,419
42
603
Common arch brick, .
.
2,417
52
737
Ordinary wall brick, .
.
2,255
65
925
Red brick, .
.
1,711
50
708
Yellow,
.
2,875
84
1,187
Machine made, .
.
1,662
49
692
Machine made, hollow, holes,
with two
1,785
54
766
Machine made, hollow, holes,
with three
1,812
84 ‘
1,194
Hollow machine made with sixteen holes, .
arch brick
1,307
39
554