664 ME. MALLET ON THE TEANSIT-VELOCITT OE EAETHQTJAKE WANES. 
Table I. — Holyhead-Rock Compression. Experiments A, 
on Hard Slate ; pressure transverse to lamination. 
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 
•085 
•000 
•000 
•0000 
2 . 
1,000 
•081 
•004 
•004 
•0052 
3. 
2,000 
•078 + 
•003 — 
•007 
•0091 
4. 
3,000 
•078 + 
•000 
•007 
•0091 
5. 
4,000 
•078 
•000 + 
•007 
•0091 
6. 
5,000 
•078 
•000 
•007 
•0091 
7* 
6,000 
•077 + 
•001 — 
•007 
•0091 
8. 
7,000 
•077 
•000 + 
•008 
•0104 
9. 
8,000 
•076 + 
•001 — 
•008 
•0104 
10. 
9,000 
•076 + 
•000 
•008 
•0104 
11. 
10,000 
•076 + 
•000 
•008 
•0104 
12 . 
11,000 
•076 
•000 + 
•008 
•0104 
13. 
12,000 
•076 
•000 
•009 
•0117 
14. 
1.3,000 
•075 + 
•001 — 
•009 
•0117 
15. 
14,000 
•075 + 
•000 
•009 
•0117 
16. 
15,000 
•075 + 
•000 
•009 
•0117 
17. 
16,000 
•075 
•000 + 
•009 
•0117 
18. 
17,000 
•075 
•000 
•009 
•0117 
19. 
18,000 
•075 
•000 
•009 
•0117 
20. 
19,000 
•075 
•000 
•010 
•0130 
21. 
20,000 
•074 + 
•001 — 
•010 
•0130 i 
22. 
21,000 
•074 + 
•000 
•010 
•0130 { 
23. 
22,000 
•074 
•000 + 
•010 
•0130 ' 
24. 
23,000 
•074 
•000 
•oil 
■0143 
25. 
24,000 
Crushed. 
•Oil 
•0143 
Table II. — Holyhead-Rock Compression. Experiments B, 
on Hard Slate ; pressure parallel to lamination. 
1. 
50 
•130 
•000 
•000 
•0000 
2. 
1,000 
•120 
•010 
•010 
•0130 
3. 
2,000 
•100 
•020 
•030 
•0390 
4. 
3,000 
•099 + 
•001- 
•031 + 
•0403 + 
5. 
4,000 
•098 
•001 + 
•032 
•0416 
1 6. 
5,000 
•097 
•001 
•032 
•0416 
1 7. 
6,000 
•096 
•001 
•032 
•0416 
1 8. 
7,000 
•094 
•002 
•036 
•0468 
i 9‘ 
8,000 
•092 + 
•002 — 
•038 + 
•0494 
9,000 
•092 + 
•000 
•038 + 
•0494 
I 
10,000 
•092 + 
•000 
•038 + 
•0494 
12. 
11,000 
•092 
•000 + 
•038 + 
•0494 
1 13. 
12,000 
•092 
•000 
■038 + 
•0494 
14. 
13,000 
•092 
•000 
•038 + 
•0494 
1 5- 
14,000 
•092 
•000 
•038 + 
•0494 
16. 
15,000 
•090 
•002 
•040 
•0520 
17. 
16,000 
•089 
•001 
•041 
•0533 
18. 
17,000 
•086 
•003 
•044 
•0572 
19- 
18,000 
•085 + 
•001 — 
•045 + 
•0585 + 
20. 
19,000 
•085 + 
•000 
•045 + 
•0585 + 
21. 
20,000 
•085 + 
•000 
•045 + 
•0585 + 
22. 
21,000 
•085 
•000 + 
•045 + 
•0585 + 
23. 
22,000 
•085 
•000 
•045 + 
•0585 + 
24. 
23,000 
•085 
•000 
•045 + 
‘0585 + 
25. 
24,000 
•082 
•003 
•048 
•0624 
26. 
25,000 
•082 
•000 
•048 
•0624 
27. 
26,000 
•080 
•002 
•050 
•0650 
28. 
27,000 
•077 
•003 
•053 
•0689 
29. 
27,000 + 
Crushed. 
•053 
•0689 
