 ... 160,000,000, and at $22 a thousand it would be $354,000 a year spent for timbers that go down in the mines. That would be in ten years $3,400,000, that they have expended for timbers that are now in the mines. How long do these timbers last, with...  Journal: Appendix. Reports - Page 189by California. Legislature - 1884Full view - About this book
 | United States. Commission upon the Sutro Tunnel (1872) - 1872 - 1062 pages
...How long do these timbers last, with poor ventilation ? Do you know, General? Mr. FOSTER. No, sir, I do not. Q. Do you know whether there is a difference between having good ventilation and poor ventilation as to the durability of timbers? A. Oh, yes; there... | |
 | United States. Sutro Tunnel Commission - Comstock Lode (Nev.) - 1872 - 1086 pages
...How long do these timbers last, with poor ventilation ? Do you know, General? Mr. FOSTER. No, sir, I do not. Q. Do you know whether there is a difference between having good ventilation and poor ventilation as to the durability of timbers? A. Oh, yes; there... | |
 | 1872 - 456 pages
...How long do these timbers last with poor ventilation ? Do you know, general ? Mr. FOSTER. No, sir, I do not. Q. Do you know whether there is a difference between having good ventilation and poor ventilation as to the durability of timbers ?—A. O, yes;... | |
 | United States. Commission upon the Sutro Tunnel (1872) - 1872 - 1070 pages
...How long do these timbers last, with poor ventilation ? Do you know, General? Mr. FOSTER. No, sir, I do not. Q. Do you know whether there is a difference between having good ventilation aud poor ventilation as to the durability of timbers? A. Oh, yes; there... | |
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