PHYSICAL TESTS OF ROAD-BUILDING ROCK. 51 
Table 2. — Results of compression tests of rock, made prior to Jan. 1, 1916 — Continued. 
WEST VIRGINIA. 
Serial 
No. 
5365 
5917 
5918 
5919 
7475 
7476 
6109 
9132 
9133 
9134 
5610 
5612 
5613 
5614 
5615 
5616 
8447 
Locality. 
County. 
Name. 
Crushing 
strength, 
pounds per 
square inch. 
Berkeley 
Renick: 
Frazier 
Snow Flace , 
Green Spring (east of). 
do 
Spring Hill 
Fairmont 
do 
do 
Sturgisson 
do 
do 
do 
do 
do 
Parkersburg 
Berkeley 
Greenbrier . . 
do 
do 
Hampshire.. 
do 
Kanawha. . 
Marion 
do 
do 
Monongalia . 
do 
do 
do 
do 
do 
Wood 
Limestone 
Crystalline limestone. . 
Limestone. 
....do 
Siliceous limestone 
Quartzite 
Sandstone 
do 
....do 
do 
Siliceous limestone 
Limestone 
Argillaceous limestone . 
Calcareous sandstone.. 
Impure limestone 
Argillaceous limestone. 
Feldspathic sandstone . 
23,350 
21,300 
17,450 
13,550 
34,400 
15,050 
12,400 
5,420 
5,720 
6,080 
22,440 
17,910 
14,300 
29; 840 
19,650 
24,850 
11,910 
WISCONSIN. 
5523 
Pebbles... 
32,600 
20,000 
23,020 
3448 
Marinette 
8656 
Lannnn 
Waukesha 
Dolomite 
Table 3. — General limiting test values. 
Type of construction. 
French 
coefficient 
of wear. 
Toughness. 
Water-bound macadam 
Bituminous macadam 
Bituminous concrete 
7 or over. . 
8 or over. . 
8 or over. 
Water-bound base course 
5 or over . . 
Granites, gneisses, schists, sandstones, and quartzites. should 
not, in general, be used in the wearing course of water-bound macadam 
roads. Shales and slates should never be used in this connection. 
For further details and explanation of results in this table and 
also for tests on all materials to January 1, 1916, see U. S. Depart- 
ment of Agriculture Bulletin 370. 
Table 4. — Geographical distribution of samples tested from January 1, 1916, to January 1, 
1922. 
State. 
Number 
of sam- 
ples. 
State. 
Number 
of sam- 
ples. 
Alabama 
31 
10 
55 
3 
16 
21 
9 
2 
12 
131 
2 
21 
Arizona 
45 
Arkansas 
6 
California 
27 
Colorado 
23 
Connecticut 
3 
Delaware 
46 
District, nf flnlnmhia 
44 
Florida 
127 
Georgia 
21 
Idaho 
Minnesota 
8 
