TESTS OF ROAD-BUILDING BOCK IN" 1916. 
Table II. — Results of compression tests of rock complete to Jan. 1, 1917- 
PENNSYLVANIA— Continued. 
21 
-Continued. 
Serial 
No. 
Locality. 
County. 
Name. 
Crushing 
strength, 
pounds 
per 
square 
inch. 
8724 
Blair 
15,480 
20,880 
9,000 
31 800 
8725 
(i) 
do 
do 
8625 
Carbon 
Blast-furnace slae 
7973 
(i) 
Chester 
7978 
(n 
do 
Mica schist 
23 500 
7979 
0) 
Salona 
( x ) 
0) 
0) 
(i) 
do 
do 
23,900 
18, 710 
26,500 
8,510 
19,250 
5578 
Argillaceous limestone 
7844 
8306 
do 
8427 
do 
do 
8465 
do 
9,640 
14, 150 
37 740 
8049 
(i) 
Elk 
FeiTUginous sandstone 
5771 
6097 
Bidwell 
do 
13.450 
9347 
.do ... 
.do 
26,050 
22, 330 
27, 500 
23,460 
20, 360 
5604 
Huntingdon 
5557 
Walford 
10518 
10672 
.. ..do 
6153 
do 
28, 580 
26, 860 
6154 
do 
..do .- 
do 
do 
do 
6155 
..do 
18, 610 
22, 930 
21,900 
6156 
do 
..do ... 
do 
..do 
6157 
. ..do 
6158 
....do 
do 
.. .do 
14, 160 
7980 
9,680 
8022 
(i)„ .-. 
(i)... 
Ferruginous sandstone 
.do 
12, 130 
14,000 
12,480 
25,250 
21, 530 
26,900 
24, 790 
26,340 
32, 560 
27,400 
8023 
(r) 
(i) 
8024 
(i) 
(i) 
...do 
11190 
Pike . . . 
9812 
Philadelphia 
3243 
McSpadden 
10345 
do... 
5830 
Prompton 
5605 
Westmoreland 
York 
7428 
York 
RHODE ISLAND. 
Westerly. 
....do.... 
....do.... 
Washington., 
....do 
....do 
Granite . 
....do.. 
....do.. 
11,740 
20, 300 
20, 750 
SOUTH CAROLINA. 
8389 
Granite 
do 
12, 990 
29,180 
5568 
Fairfield 
5586a 
do 
do 
do 
25, 790 
5586b 
..do 
do 
do 
19, 240 
5586c 
. ..do 
do 
33,880 
10531 
..do 
do 
25,540 
TENNESSEE. 
5597 
22,750 
5502 
..do 
21, 730 
5504 
. ..do 
. ..do 
do 
28, 340 
5503 
.do. . 
. do. 
38, 070 
6533 
17, 970 
VERMONT. 
East Wallingford. 
Barre 
Rutland. ... 
Washington. 
Altered diabase . 
Granite 
16,800 
19,560 
i Exact locality not known. 
