OCR Text |
Show Steel K:iils as Tit I'rops. In consideration of tho serious inroads which uro being mado on tho timber of this country by the use of wooden props in mines, it is satisfactory to not that a patent has been taken out for a method of making steel rails into pit props and supports for collieries, mines, tunnels, bridges, etc.. Tho rails aro cut at their ends and suitably framed together. In point of cost it is said that this mode of propping compares favorably with bricking brick-ing and other systems. New York Commercial Com-mercial Advertiser. |