THE ROYAL ARTILLERY INSTILL TICK 
157 
Series e . Table XXXIY. 
TO ASCERTAIN THE VALUE OF THE COEFFICIENTS OF DIFFERENT MATERIALS WITH 
VARIOUS PRESSURES AND WITH A CONSTANT SURFACE OF THIRTY-TWO SQUARE INCHES, 
UNDER THE SAME CONDITIONS OF “RATE OF MOTION 5 ’ AND “WEAR.” 
teak through surfaced iron. S = 32 square inches. 
Order of 
experiment. 
Total 
pressure. 
Value of B. 
Coefficient of 
friction. 
Rate per 
minute. 
Remarks. 
Order of 
experiment. 
Total 
pressure. 
j Value of B. 
Coefficient of 
friction. 
Rate per 
minute. 
Remarks. 
1 
tons 
05 
lbs. 
329 
354 
389 
469 
489 
529 
554 
621 
678 
676 
747 
784 
•294 
•316 
•347 
•418 
•436 
•488 
•495 
•554 
•606 
•603 
•667 
•700 
in. 
0-375 
0-75 
1-25 
3- 00 
4- 00 
7- 50 
8- 00 
12-00 
15-00 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
II 
II 
II 
10 
tons 
0-5 
lbs. 
293 
344 
379 
335 
414 
449 
519 
546 
569 
693 
719 
I 
'•260 
•307 
•338 
1*302 
*370 
•400 
•463 
•487 
•508 
•618 
•642 
in. 
0-50 
1- 25 
2- 00 
4- 00 
5- 00 
10-0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
II 
II 
II 
II 
II 
II 
II 
j CO 
1-0 
579 
748 
857 
872 
1083 
1130 
1230 
1270 
1412 
•258 
•334 
•382 
•389 
•483 
•504 
•549 
•567 
•652 
0-375 
3- 0 
4- 0 
5- 0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
II 
II 
II 
II 
n 
II 
7 
1-0 
“594 
610 
833 
923 
905 
1151 
1061 
1214 
1200 
1527 
•265 
•272 
•369 
•412 
•404 
•514 
•474 
•542 
•536 
•681 
0-50 
0-75 
4-0 
7-0 
10-0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
11 
Blow not used. 
II 
II 
II 
1-5 
935 
1240 
1240 
1566 
1513 
1791 
1791 
2033 
2068 
2346 
•278 
•369 
•369 
•466 
•450 
•533 
•533 
•605 
•615 
•698 
0-375 
2-00 
3-5 
5-0 
10-0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
II 
II 
II 
II 
II 
8 
1-5 
919 
1149 
1166 
1568 
1583 
1496 
1840 
1983 
2132 
•270 
•341 
•347 
•466 
•471 
•445 
•547 
•590 
•634 
0-5 
3- 0 
4- 0 
8-0 
10-0 
12-0 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
II 
II 
II 
II 
II 
II 
5 
2 
1267 
1647 
1861 
1652 
1639 
1925 
1776 
2203 
2184 
2107 
2342 
2270 
2555 
•266 
•367 
•415 
•364 
•361 
•427 
•397 
•489 
•490 
•470 
•527 
•508 
•576 
0-5 
2-0 
2- 5 
3- 0 
3-75 
5*0 
6-0 
io-o 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
n 
Blow not used. 
n 
n 
n 
a 
a 
n 
n 
a 
n 
6 
2 
1206 
1106 
1513 
1508, 
1808 
1810 
2068 
2361 
2311 
2574 
3041 
•269 
>247 
•337 
•336 
•403 
•405 
•470 
•529 
•520 
•576 
•678 
0-25 
0-50 
0-875 
1-5 
3-0 
5-0 
9-0 
12-0 
20-0 
25-0 
30-0 
Blow used. 
II 
Blow not used. 
II 
II 
II 
II 
II 
II 
II 
2 
2-5 
1582 
2068 
2028 
2346 
2385 
2624 
2385 
2832 
3041 
3179 
3318 
3596 
•282 
•369 
•371 
•419 
•426 
•468 
•426 
•506 
•543 
•567 
•592 
•642 
0-25 
1- 25 
2- 0 
2‘5 
4-0 
4- 5 
5- 0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
n 
Blow not used. 
tl 
II 
II 
II 
II 
9 
2-5 
1491 
1652 
1652 
1982 
2107 
2107 
2538 
3041 
3094 
3318 
3613 
•266 
•295 
•295 
•354 
•376 
•376 
•453 
•543 
•552 
•592 
•645 
0-375 
1-25 
1-5 
4- 0 
5- 0 
8-0 
12-0 
15-0 
20-0 
25-0 
30-0 
Blow used. 
Blow not used. 
11 
11 
11 
11 
