368 The Philippine Journal of Science 1922 
TABLE 1.—The effect on tensile strength—Continued. 
Cement III. Cement IV. 
Salt and normal- 
ity of solution. 7 days. (28 days. Gon: 1 year. |5 years.|7 days. |28 days. Pa 1 year. |5 years. 
| 
Potassium ni- 
trate: 
Gakic 280 337 341 335 302 166 298 805 346 
0: 305545552 235 336 363 345 327 136 182 291| 318 | 325 
0; bbe 168 245 827 833 301 116 179 309 836 | 350 
LU 249 310 316 361 302 139 203 319 845 300 
Ammonium 
nitrate: 
0.002225... 267 329 326 314 313 169 247 345 831 | 319 
Ua | cone sey 224 325 325 861 348 133 195 298 807 327 
O:S0s2-c oo 208 340 373 389 275 127 199 334 356 322 
a | Ean ane 272 330 469 289 250 171 268 366 409 325 
Sodium _ sul- 
phate: 
0,08 2s.c23- 302 410 487 328 265 179 228 321 825; 312 
0.1022... 3. 266 824 837 350 347 150 220 316 845 | 395 
Lg 0 | ih een 184 281 370 893 307 140 205 845 333 312 
fH Senin * 282 345 430 338 290 223 323 396 889 370 
Zinc suphate 
C06 263 385 392 311 323 201 262 341 353 359 
O10 267 834 370 884 323 183 248 349 818} 312 
8 eee 250 365 442 441 311 226 338 417 408 | 400 
2.00 eke 800 413 452 412 825 272 367 419 538 375 
Copper _ sul- 
phate: 
Oe s 2c, 277 366 373 838 815 182 281 361 355 368 
ey Us Dome rnees, 252 352 351 378 339 165 235 821 403 321 
0,503... c 168 : 311 393 898 340 120 284 391 418 364 
ROO ees 258 423 526 366 230 185 316 400 461 | 310 
Sodium bicar- 
bonate: 
Descccc. 278 342 349 304 296 171 246 839 883 317 
oe SEN 221 308 327 829 298 147 227 845 335 824 
O.B0sen 5: 173 264 368 338 274 195 147 283 280 285 
LUO aca, 226 307 365 345 286 185 234 247 336 300 
Potassium bi- 
carbonate: 
US Sapien: 280; 363) 3870} 816; 307| 207! 236] 351] 9348| 365 
0.10........| 251] 382} 365/ 367, 295! 165| 216| 339| 319! 336 
0. B0up cd 188} 256| 3683} 352] 276 98} 109; 274, 825] 374 
Ls 246 809 | 360 869 295 152 247 277 812 | 260 
test was made in triplicate, 2,700 briquettes in all. The first 
paper included the results up to 180 days. The remaining 
specimens have now been broken, and all the results, including 
those previously published, are given in Table 1. A list of 
the salts and the concentrations of the solutions as shown in 
Table 4 of the first paper is repeated here as Table 2. 
