Adams and Colter — Elastic Constants of Rocks. 121 



belongs with these basic rocks rather than with the granites. 

 It also approaches the essexite most nearly in its compressi- 

 bility. 



Elastic Constants of Eocks. 

 Summary of Eesults (average) expressed in Inch-Pound Units. 





E 



a 



G 



^ 1/ m \ 



Wrought iron 



28,100,000 



0-2800 



11,000,000 



21,300,000 



Cast iron 



15,000,000 



0-2500 



6,000,000 



10,000,000 



Black Belgian marble 



11,070,000 



0-2780 



4,330,000 



8,303,000 



Carrara marble 



8,046,000 



0-2744 



3,154,000 



5,946,000 



Vermont marble . . 



7,592,000 



0-2630 



3,000,000 



5,341,000 



Tennessee marble 



9,006,000 



0-2513 



3,607,000 



5.967,000 



Montreal limestone 



9,205,000 



0-2522 



3,636,000 



6,167,500 



Baveno granite . 



6,833,000 



0-2528 



2,724,800 



4,604,000 



Peterhead granite 



8,295,000 



0-2112 



3,399,000 



4,792,000 



Lily Lake granite ... 



8,165,000 



0-1982 



3,380,000 



4,517,500 



Westerly granite _ 



7,394,500 



0-2195 



3,019,700 



4,397,500 



Quincy granite (1) 



6,747,000 



0-2152 



2,781,600 



3,984,000 



Quincy granite (2) 



8,247,500 



0-1977 



3,445,000 



4,555,000 



Stanstead granite ... . 



5,685,000 



0-2585 



2,258,700 



3,940,000 



Nepheline syenite ... 



9,137,500 



0-2560 



3,635,000 



6,237,500 



New Glasgow anorthosite . 



11,960,000 



0-2620 



4,750,000 



8,368,000 



Mount Johnson essexite. _ 



9,746,000 



0-2583 



3,872,600 



6,750,000 



New Glasgow gabbro * 



15,650,000 



0-2192 



6,365,000 



9,555,000 



Sudbury diabase 



13,763,000 



0-2840 



5,364,000 



10,626,500 



Ohio sandstone 



2,290,000 



0-2900 



888,000 



1,816,000 

 6,448,000 



Plate glass 



10,500,000 



2273 



4,290,000 



Summary of Eesults (average) expressed in C.G.S. Units. 



Wrought iron 



Cast iron 



Black Belgian marble . . . 

 Carrara marble 



Vermont marble 



Tennessee marble 



Montreal limestone 



Baveno granite _ . 



Peterhead granite 



Lily Lake granite 



Westerly granite _ 



Quincy granite (1) 



Quincy granite (2) . . 



Stanstead granite 



Nepheline syenite . 



New Glasgow anorthosite 

 Mount Johnson essexite.. 

 New Glasgow gabbro * ._ 



Sudbury diabase 



Ohio sandstone 



Plate glass 



E 



19 37 

 10-34 

 7-24 

 5-54 

 5-24 

 6-21 

 6-35 

 4-71 

 5-71 

 5-63 

 5-09 

 4-64 

 5-68 

 3-92 

 6-29 

 8-25 

 6-71 

 10-80 

 9-49 

 1-58 

 7-24 



0-2800 

 0-2500 

 0-2780 

 0-2744 

 0-2630 

 0-2513 

 0-2522 

 0-2528 

 0-2112 

 0-1982 

 0-2195 

 0-2152 

 0-1977 

 0-2585 

 0-2560 

 0-2620 

 0-2583 

 02192 

 0-2840 

 0-2900 

 02273 



7-590 

 4-132 

 2-982 

 2-171 

 2-069 

 2-482 

 2-504 

 1-875 

 2-340 

 2-330 

 2-080 

 1-916 

 2-373 

 1-556 

 2-505 

 3-275 

 2-670 

 4-380 

 3-700 

 •612 

 2-960 



10 11 

 10 11 

 10 u 

 10 u 

 10 11 

 10 11 

 10 11 

 10 11 

 10 n 

 10 11 

 10 11 

 10 n 

 10 11 

 10 u 

 10 u 

 10 11 

 10 11 

 10 11 

 10 11 

 10 n 

 10 n 



D 



l/_m_\ 



3\ m-2/ 



E 



14-680 

 6 897 

 5-736 

 4-090 

 3-680 

 4-115 

 4-250 

 3-178 

 3-300 

 3-103 

 3-029 

 2-750 

 3-140 

 2-718 

 4-290 

 5-760 

 4-650 

 6-589 

 7-329 

 1-250 

 4-439 



10 11 

 10 11 

 10 11 

 10 n 

 10' 1 

 10 11 

 10 11 

 10' 1 

 10" 

 10 n 

 10 11 

 10 11 

 10 11 

 10" 

 10 11 

 10 11 

 10 11 

 10 11 

 10 11 

 10 11 

 10 u 



If the nepheline syenite be included with the basic rocks, an 

 average value of D is obtained of 8,308,000. 



This omits from consideration the sandstone, it being a rock 

 * See page 112. 



