160 
MINUTES OF PROCEEDINGS OF 
Table XXVII. 
GROUND IRON THROUGH GROUND IRON. 
S = 32 square inches. 
I Order of 
| experiment. 
Total 
pressure. 
Value of R. 
Coefficient of 
friction. 
Rate per 
minute. 
Remarks. 
Order of 
experiment. 
Total 
pressure. 
Value of R. 
Coefficient of 
friction. 
Rate per 
minute. 
Remarks. 
tons 
lbs. 
in. 
tons 
lbs. 
in. 
355 
•317 
3-0 
Blow not used. 
484 
•432 
10-0 
Blow not used. 
360 
•321 
5-0 
Blow used. 
504 
•450 
10-0 
Blow used. 
1 
0-5 
375 
•334 
8-0 
Blow not used. 
10 
0-5 
523 
•467 
10-0 
II 
365 
•326 
10-0 
Blow used. 
528 
•471 
10-0 
// 
410 
•366 
15-0 
,i 
573 
•511 
10-0 
Blow not used. 
459 
•410 
20-0 
Blow not used. 
588 
■525 
10-0 
II 
1146 
•511 
20-0 
Blow used. 
1102 
•492 
20-0 
II 
1146 
•511 
20-0 
„ 
1181 
1-531 
20-0 
Blow used. 
4 
1 
1136 
•507 
20-0 
n 
7 
1 
1254 
1-559 
20-0 
Blow not used. 
1216 
•542 
20-0 
Blow not used. 
1341 
|-599 
20-0 
II 
1251 
•559 
20-0 
// 
1343 
,•600 
20-0 
Blow used. 
1282 
•572 
20.0 
II 
1404 
•622 
20*0 
II 
1507 
•450 
12-0 
Blow used. 
2378 
•707 
15-0 
II 
1383 
•412 
15-0 
Blow not used. 
2176 
;647 
15-0 
Blow not used. 
3 
1-5 
1414 
•421 
15-0 
Blow used. 
8 
1*5 
2082 
•619 
20-0 
Blow used. 
1293 
1-385 
15-0 
n 
2475, 
•736 
20 0 
II 
1489 
: -443 
15-0 
Blow not used. 
1857, 
•552 
20-0 
Blow not used. 
1404 
•418 
20-0 
a 
2092 
•662 
20-0 
II 
1925 
•429 
20-0 
II 
2010 
•449 
20*0 
Blow used. 
1958 
•437 
20-0 
II 
2063 
•462 
20-0 
„ 
5 
2 
2227 
•497 
20-0 
II 
6 
2 
2479 
•553 
20-0 
a 
1935 
•431 
30-0 
Blow used. 
2218 
•495 
20-0 
Blow not used. 
2167 
•483 
30-0 
n 
2620 
•584 
20-0 
„ 
2483 
•554 
300 
// 
2635 
•588 
20-0 
II 
1944' 
•347 
2-0 
// 
3033 
•541 
4-0 
II 
2098 
•374 
3-0 
// 
3208 
•588 
5-0 
II 
2 
2*5 
2011! 
•459 
4-0 
Blow not used. 
9 
2-5 
3351 
•598 
15-0 
Much, scored. 
2028 
•462 
5-0 
II 
2618 
•467 
20-0 
Blow used. 
2144 
•483 
5-0 
II 
2856 
•510 
20-0 
n 
2159 
•385 
10-0 
Blow used. 
2885 
•515 
20-0 
a 
