=====================================+============+============
Sand. | At 7 days. | At 28 days.
-------------------------------------+------------+------------
Ottawa (Standard) | 305 lb. | 414 lb.
Monterrey, 1-1/2 parts, } | |
Hornos, 1-1/2 parts } | 188 " | 313 "
Monterrey | 253 " | 365 "
Hornos | 202 " | 301 "
Manufactured sand, Company's crusher | 372 " | 566 "
Hornos, 2 parts, } | |
Crusher sand, 1 part } | 231 " | 352 "
Hornos, 1-1/2 parts, } | |
Crusher sand, 1-1/2 parts } | 265 " | 346 "
Hornos, 1 part, } | |
Crusher sand, 2 parts } | 248 " | 328 "
=====================================+============+============
The Hornos sand was used during a few weeks in the latter part of 1908,
when the crusher was unable to produce all that was required. Its use
was restricted to thick walls which were required to be water-tight, and
it was always used in equal proportions with the crusher dust.