Table V. — Holyhead-Eock Compression. Experiments E, 
on Soft 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 
•088 
•000 
•000 
•0000 
2. 
1,000 
•087 
•001 
•001 
■0014 
3. 
2,000 
•086 + 
•001— 
•001 
•0014 
4. 
3,000 
•086 
•000+ 
•002 
•0029 
5. 
4,000 
•085 
•001 
•002 
•0029 
6. 
5,000 
•085 
•000 
•003 
•0043 
7. 
6,000 
•079 
•006 
•009 
•0129 
8. 
7,000 
•077 + 
•002— 
•009 
•0129 
i 9* 
8,000 
•077 + 
•000 
•009 
•0129 
! 10. 
9,000 
•077 
•000+ 
•009 
•0129 
10,000 
•077 
•000 
•009 
•0129 
1 
! 12 . 
1 1,000 
•077 
•000 
•oil 
•0158 
13. 
12,000 
•075 
•002 
•013 
•0187 
14. 
13,000 
•060 
•015 
•028 
•0404 
j 15. 
14,000 
•050 
•010 
•038 
•0548 
16. 
15,000 
Cruslied, 
•038 
•0548 
Note. — The cube E was 0'693 inch on the side, and the necessary reductions have been 
made in column 2 and subsequent ones. 
Table VI. — Holyhead-Eock Compression. Experiments F, 
on Soft Slate ; pressure parallel to lamination. 
Soft 
Slate. 
1. 
50 
•107 
•000 
•000 
•0000 
2. 
1000 
•105 
•002 
•002 
•0029 
3. 
2000 
•102 + 
•003 — 
•002 
•0029 ; 
4. 
3000 
•102 
•000 + 
•002 
•0029 
5. 
4000 
•102 
•000 
•005 
•0072 i 
6. 
5000 
•099 
•003 
•008 
•0115 i 
7. 
6000 
•097 
•002 
•010 
•0147 
8. 
7000 
•089 
•008 
•018 
•0259 
9. 
8000 
•080 
•009 
•027 
•0389 
10 . 
8000 + 
Crushed. 
•027 
•0389 
Note. — The cube E was 0'693 inch on the side, and the necessary reductions have been 
made in column 2 and subsequent ones. 
Table VII. — Holyhead-Eock Compression. Experiments G, 
on Soft Quartz ; pressure transverse to lamination. 
1. 
50 
•093 
•000 
•000 
•0000 
2. 
1,000 
•093 
•000 
•000 
•0000 
3. 
2,000 
•093 
•000 
•000 
•0000 
4. 
3,000 
•090 
•003 
•003 
•0043 
5. 
4,000 
•086 + 
•004 — 
•003 
•0043 
6. 
5,000 
•086 + 
•000 
•003 
•0043 
7. 
6,000 
•086- 
•000 + 
•003 
•0043 
8. 
7,000 
•086 
•000 
•007 
•0101 
9. 
8,000 
•085 + 
•001 — 
•007 
•0101 
10. 
9,000 
•085 + 
•000 
•007 
•0101 
11. 
10,000 
•085 
•000 + 
•008 
•0115 
12 . 
11,000 
•084 
•001 
•009 
•0129 
13. 
12,000 
•081 
•003 
•012 
•0176 
14. 
13,000 
•068 
•013 
•025 
•0359 
15. 
14,000 
•060 
Crushed before being fully loaded. 
Note. — The cube G was 0-694! inch on the side, and the necessary reductions have 
been made in column 2 and subsequent ones. 
