330
EXPOSITION AT VIENNA.
wall thick enough to pass inspection, while the thickness promotes rapid laying. As a general rule the dimensions increase in breadth and length southward, and decrease in thickness. For example, a Boston brick is about 2|- by 3| by 7^ inches. In Valparaiso, Chili, they are made IF by 10 by 18 inches. Cuban brick are about 3F by 6 by 13 inches. New Orleans, 2-| by 4| by 9 inches. Philadelphia (common) are usually about 2^ by 4 by 8^ inches.
A Philadelphia brick contains about 85.6 cubic inches of clay. A Boston, or a Hudson Biver brick, contains about 69.12 cubic inches; therefore, twenty-five thousand (25,000) Philadelphia bricks have the volume of thirty thousand nine hundred and thirty-two (30,932) of the Eastern bricks.
Mi Paul Bonneville, in his Report upon the Bricks and Tiles of the Paris Exposition, 1867, gives the following table showing the—
Dimensions of Bricks of several Countries.
LOCALITY.
Length.
Breadth.
Thickness.
Volume.
Burgundy,.
m.
0.220
m.
0.110
m.
0.060
c. c.
1,452
Montereau,.
0.220
0.110
0.055
1,331
Larcelles, red, largest,
0.220
0.110
0.050
1,210
Larcelles, red, seconds, .
0.190
0.100
0.045
940
“ Country brick,” Paris, .
0.220
0.110
0.050
1,210
“ Country brick,” Paris, .
0.220
0.100
0.060
1,320
Flemish,.
0.210
0.110
0.047
1,085
English,.
0.250
0.110
0.060
1,650
English,.
0.238
0.115
0.077
2,107
English,.
0.251
0.124
0.076
2,400
Holland,.
0.260
0.120
0.054
1,684
Experiments made upon French brick show that the resistance to breaking strain ranges from eight kilogrammes the square centimetre for ordinary soft brick, to twenty kilogrammes for brown Burgundy bricks, which will also bear one hundred and ten to one hundred and fifty kilogrammes before crushing.