. Report of the geological exploration of the fortieth parallel . ough meeting with some opposition on account of its great cost, hassince been generally adopted and is now used by all the mines on the consists in framing timbers together in rectangular sets, each set beingcomposed of a square base, placed horizontally, formed of four timbers, sills,and crosspieces, 4 to 6 feet long, framed together, surmounted by four posts, 6to 7 feet high, at each corner, and capped by a frame-work similar to that ofthe base. These cap-pieces, forming the top of any set, are at the same timethe si
. Report of the geological exploration of the fortieth parallel . ough meeting with some opposition on account of its great cost, hassince been generally adopted and is now used by all the mines on the consists in framing timbers together in rectangular sets, each set beingcomposed of a square base, placed horizontally, formed of four timbers, sills,and crosspieces, 4 to 6 feet long, framed together, surmounted by four posts, 6to 7 feet high, at each corner, and capped by a frame-work similar to that ofthe base. These cap-pieces, forming the top of any set, are at the same timethe sills or base of the next set above, the posts, as the sets rise one above theother in the stope, being generally placed in position directly over those somewhat complicated system of timbering may also be described,in other terms, as a succession of horizontal floors, composed of timbers thatare framed together in rectangular sets, 4 to 5 feet square, the floors beingsupported one above the other by posts 7 to 8 feet high. Fig. 2, on Plate IV, Hale IV. Fit) /Scale id i 1 1 ■ - 1 1
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