104 
EXPOSITION AT VIENNA. 
The clay is found in inexhaustible quantities stratified in 
beds of the tertiary epoeh, ranging from five to sixty feet 
in thickness. Some of these beds oontain 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, 51,- 
broad, 2\ thick,= 290 X140 X 65 millimetres, beiug consid- 
erably larger thau ours. 
The strength of these bricks has beeil carefully ascer- 
tained 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 breaJeing strain. 
[Experiments by Professor F. Rebiiau.] 
COEFFICIENT OF RESISTANCE. 
DESCRIPTION OF THE BRICKS. 
Breaking with 
a load of zoll 
(inch) pounds. 
Kilos per one 
square c. m. 
Zoll (Inch) 
pounds per one 
squareinch. 
Common, 
Common arcli brick, . 
Ordinary wall brick, . 
Red brick, 
Yellotv, 
Macliine made, 
Machine made, hollow, witli two 
holes, 
Machine made, hollow, with three 
holes, 
Hollow machine made arch brick 
with sixteen holes, .... 
1,419 
2,417 
2,255 
1,711 
2,875 
1,662 
42 
52 
65 
50 
84 
49 
603 
737 
925 
708 
1,187 
692 
1,785 
1,812 
1,307 
54 
84 
39 
766 
1,194 
554