ELASTIC CONSTANTS OF ROCKS. 
6 9 
Elastic Constants of Rocks. 
SUMMARY OF RESULTS (AVERAGE) EXPRESSED IN INCH-POUND UNITS. 
Specimen. 
E 
a 
C 
D- l l m \ E 
3\m-2/ 
Wrought iron 
28,100,000 
15,000,000 
11,070,000 
8,046,000 
7,592,000 
9,006,000 
9,205,000 
6,833,000 
8,295,000 
8,165,000 
7,394,500 
6,747,000 
8,247,500 
5,685,000 
9,137,500 
11,960,000 
9,746,000 
15,650,000 
13,763,000 
2,290,000 
10,500,000 
0.2800 
0.2500 
0.2780 
0.2744 
o . 2630 
0.2513 
0.2522 
0.2528 
O. 2112 
0.1982 
0.2I 9 5 
0.2152 
0.1977 
0.2585 
0.2560 
O.262O 
0.2583 
o. 2192 
0.2840 
0.2900 
0.2273 
\ 1 ,000,000 
6,000,000 
4,330,000 
3,154,000 
3,000,000 
3,607,000 
3,636,000 
2,724,800 
3,399,000 
3,380,000 
3,019,700 
2,781,600 
3,445,000 
2,258,700 
3,635,000 
4,75O,ooo 
3,872,600 
6,365,000 
5,364,000 
888,000 
4,290,000 
21,300,000 
10,000,000 
8,303.000 
5,946,000 
5,341,000 
5,967,000 
6,167,500 
4,604,000 
4,792,000 
4,517,500 
4,397,500 
3,984,000 
4,555,ooo 
3,940,000 
6,237,500 
8,368,000 
6,750,000 
9,555,000 
10,626,500 
1,816,000 
6,448,000 
Cast iron 
Black Belgian marble. . . . 
Carrara marble 
Vermont marble 
Tennessee marble 
Montreal limestone 
Baveno granite . . 
Peterhead granite .... 
Lily Lake granite 
Westerly granite 
Quincy granite (i) 
Ouincy granite (2) 
Stanstead granite 
Nepheline svenite 
New Glasgow anorthosite 
Mount Johnson essexite . . 
New Glasgow gabbro* . . . 
Sudbury diabase 
Ohio sandstone 
Plate glass 
SUMMARY OF RESULTS (AVERAGE) EXPRESSED IN C. G. S. UNITS. 
Wrought iron 
19-37 X io n 
10.34 X io u 
7.24 X io n 
5-54 X io n 
5.24 X lo 11 
6.21 X io n 
6-35 X lo 11 
4-71 X lo 11 
5-71 X io n 
5.63 X io n 
5.09 X io n 
4.64 X lo 11 
5-68 X io n 
3-92 X io n 
6.29 X io n 
8.25 X io n 
6.71 X io n 
10.80 X lo 11 
9-49 X lo 11 
1.58 X io n 
7.24 X io n 
0.2800 
o . 2500 
0.2780 
0.2744 
o . 2630 
0.2513 
0.2522 
0.2528 
O.2II2 
o. 1982 
0.2195 
O.2I52 
0.1977 
0.2585 
o . 2560 
o . 2620 
0.2583 
o. 2192 
o . 2840 
0.2900 
0.2273 
7.590 X lo 11 
4.132 X 10" 
2.982 X ib 11 
2.171 X io n 
2.069 X io n 
2.482 X io n 
2.504 X lo 11 
1.875 X lo 11 
2.340 X lo 11 
2.330 X lo 11 
2.080 X lo 11 
1.916 X lo 11 
2-373 X io n 
1.556 X lo 11 
2.505 X lo 11 
3.275 X lo 11 
2.670 X io n 
4.380 X lo 11 
3.700 X io n 
.612 X io n 
2.960 X io n 
14.680 X lo 11 
6.897 X io n 
5.736 X io u 
4.090 X lo 11 
3.680 X lo 11 
4.115 X lo 11 
4.250 X lo 11 
3.179 X io n 
3.300 X lo 11 
3.103 X io n 
3.029 X io n 
2.750 X lo 11 
3. 140 X io n 
2.718 X lo 11 
4.290 X io n 
5.760 X io n 
4.650 X lo 11 
6.589 X io n 
7.329 X lo 11 
1.250 X io n 
4.439 X lo 11 
Cast iron 
Black Belgian marble. . . . 
Carrara marble 
Vermont marble 
Tennessee marble 
Montreal limestone 
Baveno granite 
Peterhead granite 
Lily Lake granite. . . . 
Westerly granite .... 
Quincy granite (i) . . . 
Quincy granite (2) 
Stanstead granite 
Nepheline syenite 
New Glasgow anorthosite 
Mount Johnson essexite. . 
New Glasgow gabbro * ... 
Sudbury diabase 
Ohio sandstone 
Plate glass 
57 
