TESTS OF SLATES BY MERRIMAN. 
123 
Color and firm. 
Mark on 
speci 
men. 
Strength- 
modulus of 
rupture in 
pounds per 
square 
inch. 
Tough- 
ness—ul- 
timate 
deflec- 
tion in 
inches oi 
supports 
22 inches 
apart. 
Density- 
specific 
gravity. 
Softness- 
amount it 
grams 
abraded 
by 50 turns 
of a small 
grind- 
stone. 
Porosity 
per cent o 
water ab- 
sorbed in 
21 hours. 
0. 105 
.090 
. 209 
.167 
Corro- 
dibility — 
per cent 
of weight 
losl in 
acid solu 
lion in 63 
hours. 
Bluest Williams Slate Go. 
Wl 
W2 
W3 
W4 
Means.. 
PI 
P2 
P3 
P4 
Means . . 
Bl 
B2 
B3 
Means .. 
Mol .... 
Mo2 .... 
Mo3 .... 
Mo4 .... 
Means .. 
VI 
V2 
Means . . 
Rl 
R2 
R3 
R4 
Means . . 
M5 
M6 
M7 
M8 
Means . . 
Ml 
M2 
M3 
M4 
Means . . 
8,590 
8, 250 
10, 700 
8,620 
0.17 
.19 
.31 
.24 
•_'. 788 
2.754 
2.795 
•_'. 788 
0.073 
.038 
. 097 
.033 
0.281 
.801 
. 223 
.270 
9,040 
. 227 
2.781 
. (ICO 
. in; 
.394 
Blue;« A. L. Pitts . 
8,540 
9, 010 
11,970 
9,880 
.25 
.18 
.25 
.22 
2. 805 
2. 790 
2. 788 
2.781 
.095 
.159 
.138 
.038 
.332 
.248 
552 
.154 
.163 
. 275 
.218 
9,850 
.225 
2.791 
.108 
. 216 
.323 
Blue;'' Merrill Brownville 
Slate Co 
8, 860 
9, 050 
11,720 
.17 
.21 
.22 
2.790 
2.804 
2.799 
.243 
.360 
.192 
.189 
. L28 
.128 
.366 
.284 
.264 
9.880 
.200 
2.798 
. 265 
. lis 
.305 
Blue;6 Monson Consoli- 
dated Slate Co 
9, 500 
11,370 
7, COO 
8,640 
.24 
.22 
.19 
.17 
2. 7% 
2. 795 
2.794 
2.791 
.234 
.302 
.271 
.218 
.181 
.181 
.206 
.186 
.282 
.384 
.234 
. 243 
•9, 130 
.205 
2. 794 
.256 
.188 
.286 
Green; Vermont Unfading 
Green Slate Co 
6,250 
6,580 
.19 
.26 
2. 783 
2.759 
.326 
.356 
.300 
.162 
.277 
.313 
6,410 
.225 
2.771 
.341 
.231 
.295 
Green; Rising & Nelson 
Slate Co 
6,790 
11,040 
3,470 
7,700 
.24 
.22 
.13 
.24 
2. 750 
2.740 
2.733 
2. 720 
.184 
.183 
. 209 
.185 
.429 
.220 
.365 
.286 
.433 
. 722 
1.067 
.849 
7,250 
.207 
2.736 
.190 
.325 
.768 
Green ;c Mathews Consoli- 
dated Slate Co 
7,090 
5,470 
10,130 
9,490 
.22 
.15 
2.783 
2.782 
2.786 
2.781 
.286 
.203 
.244 
.172 
. 376 
.409 
.360 
.351 
413 
128 
.20 
.409 
8,050 
.190 
2.783 
. 226 
.374 
.379 
Red; Mathews Consoli- 
dated Slate Co 
6,850 
9,870 
11,340 
8, 820 
.18 
.27 
.25 
.23 
2.834 
2.853 
2.853 
2.853 
.069 
.099 
.119 
.304 
.153 
. 251 
.334 
.235 
.249 
. 12b 
.507 
.311 
9,220 
. 232 
2.848 
.148 
.243 
.373 
« Designated as very dark greenish gray in table facing page 124. 
b Designated as very dark gray in table facing page 124. 
p Designated as bright green in table facing page 124. 
