318 COX, REIBLING, AND REYES. 
used throughout the Island of Luzon is a very poor building 
material. 
TABLE I.—Compression strength of 6-inch cubes of volcanic tuff. 
. Average strength 
Weight icp ds 20 | in pounds per 
per cubic square inch. 
Quarry. Date mined. | meter | 
yer Bi | 
age). irst . First 
ma. Ultimate. eae Ultimate. 
| Kilos 
94,300] 96,500 
Binaneena ne == eae Apr. 17,1876 1,540 6, 500 12, 500 263 385 
5, 650 12, 800 
16, 200 16, 300 
5, 300 6, 550 
A 9, 700 9, 900 
Cavite 242 23-tes Sores oes July 14,1879 1, 480 3, 400 4,800 173 193 
6, 500 6, 600 
8, 550 8, 850 
4,100 6, 675 
Unknown-- oes = eee Sept. 8, 1880 1, 456 8, 000 8, 550 184 212 
5, 900 6, 350 
4,300 7, 100 
3, 500 7,000 ; 
f F i 1 
(Banadeross2 oes neces July 1,1882 1,520 5, 600 3,000 59 230 
9, 400 11, 040 
2,300 4,250 
5, 250 5, 400 
. Li, > 123 
DOlsa- cons cee ae ee Jan. 17,1912 1, 560 ¥ 3, 700 147 
6, 700 7, 800 
10, 000 16, 425 
: 8, 500 16, 950 
iBinangona nesses see ee [aaa doscee=s 1,665 7,200 16, 650 276 467 
14, 000 17, 100 
6,525 
8, 000 8. 760 
Cauit es ene ce ceme eee eee | eee Coie a 1, 665 5, 100 = 905 185 211 
GED 7, 250 
Corners of cube broken off. 
Recently, important structures have been built almost exclu- 
sively of reinforced concrete, and concrete blocks have been 
used for small buildings. The high cost of cement and good 
