Table III. — Holyhead-Eock Compression. Experiments C, 
on Hard Quartz ; pressure transverse to lamination. 
Hard 
Quartz. 
No. of 
experiment. 
Pressure due to 
the unit of 
surface 
= 1 square inch. 
Compression 
readings of the 
column of 
0'707 inch. 
Compression 
readings due to 
the successive 
loads. 
Total compressions 
produced by the 
load on column 
of 0-707 inch. 
Total compressions 
reduced to a column 
of unit height 
= 1 inch. 
lbs. 
in. 
in. 
in. 
in. 
1. 
50 
•100 
•000 
•000 
•0000 
2. 
1,000 
•097 
•003 
•003 
•0039 
3. 
2,000 
•095 + 
•002- 
•003 
•0039 
4. 
3,000 
•095 + 
•000 
•003 
•0039 
5. 
4,000 
•095 + 
•000 
•003 
•0039 
6. 
5,000 
•095 + 
•000 
•003 
•0039 
7. 
6,000 
•095 
•000 + 
•003 
•0039 
8. 
7,000 
•095 
•000 
•003 
•0039 
9. 
8,000 
•095 
•000 
•005 
•0065 
10. 
9,000 
•094 
•001 
•006 
•0078 
11. 
10,000 
•093 + 
•001- 
•006 
•0078 
12. 
11,000 
•093 + 
•000 
•006 
•0078 
13. 
12,000 
•093 + 
•000 
•006 
•0078 
14. 
13,000 
•093 
•000 + 
•006 
•0078 
15. 
14,000 
•093 
•000 
•006 
•0078 
16. 
15,000 
•093 
•000 
•006 
•0078 
17. 
16,000 
•093 
•000 
•007 
•0091 
18. 
17,000 
•092 + 
•001 — 
•007 
•0091 
19. 
18,000 
•092 
•000 + 
•007 
•0091 
20. 
19,000 
•092 
•000 
•008 
•0104 
21. 
20,000 
•091 + 
•001 — 
•009 + 
•0117 + 
22. 
21,000 
•088 
•003 + 
•012 
•0156 
23. 
22,000 
•083 + 
•005 — 
•012 
•0156 
24. 
23,000 
•083 + 
•000 
•012 
•0156 
25. 
24,000 
•083 + 
•000 
•012 
•0156 
i 26. 
25,000 
•083 
•000 + 
•012 
•0156 
27. 
26,000 
•083 
•000 
•017 
•0221 
28. 
27,000 
•082 + 
•001- 
•017 
•0221 
29. 
28,000 
•082 + 
•000 
•017 
•0221 
30. 
29,000 
•082 + 
•000 
•017 
•0221 
31. 
30,000 
•082 
•000 + 
•017 
•0221 
32. 
31,000 
•082 
•000 
•017 
•0221 
33. 
32,000 
•082 
•000 
•018 
•0234 
34. 
33,000 
•081 + 
•001- 
•018 
•0234 
35. 
34,000 
•081 
•000 + 
•019 
•0247 
36. 
35,000 
•080 + 
•001 — 
•019 
•0247 
37. 
36,000 
•080 
•000 + 
•020 
•0260 
38. 
36,000 + 
Crushed. 
•020 
•0260 
Table IV. — Holyhead-Eock Compression. Experiments D, 
on Hard Quartz ; pressure parallel to lamination. 
Hard 
Quartz. 
1. 
50 
•106 
•000 
•000 
•0000 ! 
2. 
1,000 
•106 
•000 
•000 
•0000 ■ 
3. 
2,000 
•106 
•000 
•000 
•0000 1 
4. 
3,000 
•106 
•000 
•000 
•0000 * 
5. 
4,000 
•106 
•000 
•000 
•0000 i 
6. 
5.000 
6.000 
•102 
•004 
•004 
•0052 j 
7. 
•100 + 
•002 — 
•004 
•0052 
8. 
7,000 
•100 + 
•000 
•004 
'0052 ! 
9. 
8,000 
•100 + 
•000 
•004 
•0052 
10. 
9,000 
•100 
•000 + 
•004 
•0052 ! 
11. 
10,000 
•100 
•000 
•004 
•0052 
12. 
11,000 
•100 
•000 
•006 
•0078 
13. 
12,000 
•098 + 
•002- 
•006 
•0078 
14. 
13,000 
•098 
•000 + 
•008 
•0104 1 
15. 
14,000 
•097 
•001 
•009 
•0117 ! 
16. 
15,000 
•096 
•001 
•010 
•0130 ! 
17. 
16,000 
•093 
•003 
•013 
•0169 
18. 
17,000 
•092 
•001 
•014 
•0182 
19. 
18,000 
•090 + 
•002 — 
•014 
•0182 
20. 
19,000 
•090 
•000 + 
•016 
•0208 
21. 
20,000 
Crushed. 
•016 
•0208 
4x2 
