A Treatise on Mine-surveying |
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Page viii
... Inclination of the magnetic - needle , CHAPTER V. PAGE 28 29 31 31 22335 31 32 33 35 37 39 39 41 43 43 ** = *** 43 45 47 48 48 49 SURVEYING WITH THE MAGNETIC - NEEDLE IN THE PRESENCE OF IRON . Influence of iron rails , Local attraction ...
... Inclination of the magnetic - needle , CHAPTER V. PAGE 28 29 31 31 22335 31 32 33 35 37 39 39 41 43 43 ** = *** 43 45 47 48 48 49 SURVEYING WITH THE MAGNETIC - NEEDLE IN THE PRESENCE OF IRON . Influence of iron rails , Local attraction ...
Page xii
... inclination of a mineral deposit , Determination of a point at the surface directly above one under- 222 ground , 226 ยท Holing from one excavation to another , 228 Sinking shafts from several levels , 232 The cubical content of a mine ...
... inclination of a mineral deposit , Determination of a point at the surface directly above one under- 222 ground , 226 ยท Holing from one excavation to another , 228 Sinking shafts from several levels , 232 The cubical content of a mine ...
Page 5
... inclination downwards measured in degrees from the horizontal . As the dip of veins is usually great , it is somtimes measured from the vertical , and is then termed underlie or hade . The portion of a mineral deposit occur- ring at the ...
... inclination downwards measured in degrees from the horizontal . As the dip of veins is usually great , it is somtimes measured from the vertical , and is then termed underlie or hade . The portion of a mineral deposit occur- ring at the ...
Page 11
... inclination formed by the measured line and the horizon . Lines are usually measured with chains , tapes , or rods , divided into fathoms , yards , links , feet , or some other unit of measure- ment . ( a . ) The Chain . The instrument ...
... inclination formed by the measured line and the horizon . Lines are usually measured with chains , tapes , or rods , divided into fathoms , yards , links , feet , or some other unit of measure- ment . ( a . ) The Chain . The instrument ...
Page 14
... inclination . The rate of inclination ( the ratio of the base to the perpendicular ) is the cotangent of the angle of inclination . ensure the raised end being exactly above the right spot 14 MINE - SURVEYING .
... inclination . The rate of inclination ( the ratio of the base to the perpendicular ) is the cotangent of the angle of inclination . ensure the raised end being exactly above the right spot 14 MINE - SURVEYING .
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Common terms and phrases
accuracy accurate adjusted back-sight base-line bearing bore-hole brass calculated centre chain City Guilds clamped clinometer coal colliery collimation colour compass compass-box contour lines cord corner cosec cotan cross-wires curve determined direction distance employed equal error fathoms feet fixed fore-sight glass graduated ground height hole horizontal circle inches inches in diameter inclination instrument intersection latitude length lode magnetic bearing magnetic meridian magnetic-needle marked means measured method metres mine-surveying miner's dial mines needle observations obtained offsets Ordnance Survey parallel parallel ruler perpendicular placed plane plate plotting plumb-bob plumb-line plummet position protractor represented right angles safety-lamp scale seam shaft side Silver King spirit-level square staff station station-line strike and dip surface surface-surveys survey tacheometer tacheometry taken tangent screw telescope theodolite transit-theodolite traverse triangle tripod tube underground vernier vernier-plate vertical angles wire yards zero