Canadian mining journal January-June 1905 . ©= ® SINGLE STATION tiHC ft ICE or -BUT s/IReoi^ SiOff Of -BUT. stadia method. If accurate work is to be done, a transit andband tape are employed; for levelling, an ordinary level isused. All elevations are calculated from the bench marklocated on the Bank of Montreal building in Rossland. Underground Surveys.—In underground work the transit(reading to minutes) and steel tape are used entirely. Survey. deep. Into each of these holes is driven a wooden plug, levelwith the back. Horseshoe nails, with a pierced head, areplaced in the plugs to allow of
Canadian mining journal January-June 1905 . ©= ® SINGLE STATION tiHC ft ICE or -BUT s/IReoi^ SiOff Of -BUT. stadia method. If accurate work is to be done, a transit andband tape are employed; for levelling, an ordinary level isused. All elevations are calculated from the bench marklocated on the Bank of Montreal building in Rossland. Underground Surveys.—In underground work the transit(reading to minutes) and steel tape are used entirely. Survey. deep. Into each of these holes is driven a wooden plug, levelwith the back. Horseshoe nails, with a pierced head, areplaced in the plugs to allow of plumb bobs being hung fromthem. A brass tag with the number of the station on it isfastened beside each nail. The advance is surveyed twice a month. It is taken upas follows:—(See Diagram Transit set up at Station 37);Vernier set 0 degree, on Station 33; a sight is then takenon Station 31 and angle read. Angles are always read twice, bydoubling, as a check. The elevation of Station 81 is located,by means of a button set on plumb bob at 81, on a horizontalline from the transit. The horizontal distance between 37and 81 is measured to the nearest hundredth of a foot, andcontours taken, left and right, from the line. This operationis repeated at 81 and sight is taken to face of drift. Location op Square Sets.—Transit set up at Station 5.(See diagram). Vernier at 0 degree B. Sight taken at Sta-tion 6, and the angle turned in a clock-l
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
