A Treatise on Mine-surveying |
From inside the book
Results 1-5 of 80
Page 1
... direction , or irrup- tions of water , quicksand , or firedamp , giving rise to loss of life and property - which have too often resulted from incorrect or imperfect mine - plans . Historical Sketch . The origin of mine - surveying must ...
... direction , or irrup- tions of water , quicksand , or firedamp , giving rise to loss of life and property - which have too often resulted from incorrect or imperfect mine - plans . Historical Sketch . The origin of mine - surveying must ...
Page 2
... directions by means of spiral screws acting on horizontal and vertical cog - wheels . It was hollowed out , and contained a metal tube , at right angles to which were glass cylinders at each end of the beam . The cylinders had special ...
... directions by means of spiral screws acting on horizontal and vertical cog - wheels . It was hollowed out , and contained a metal tube , at right angles to which were glass cylinders at each end of the beam . The cylinders had special ...
Page 5
... direction was set out . Mineral Deposits . For practical purposes mineral deposits may be divided into tabular deposits , including mineral veins , beds , and seams , and irregular deposits , including masses , stock- works , and ...
... direction was set out . Mineral Deposits . For practical purposes mineral deposits may be divided into tabular deposits , including mineral veins , beds , and seams , and irregular deposits , including masses , stock- works , and ...
Page 6
... direction of the veins generally for the purpose of searching for a new vein , or of connecting two known veins , is termed a cross - cut . The extreme end of any level or cross - cut is called the forebreast or end . A stope is the ...
... direction of the veins generally for the purpose of searching for a new vein , or of connecting two known veins , is termed a cross - cut . The extreme end of any level or cross - cut is called the forebreast or end . A stope is the ...
Page 13
... direction , while the follower holds one end of it at the starting - point . An arrow is then driven perpen- dicularly into the ground by the leader at the point where the chain ends . He then proceeds onward , drawing the chain after ...
... direction , while the follower holds one end of it at the starting - point . An arrow is then driven perpen- dicularly into the ground by the leader at the point where the chain ends . He then proceeds onward , drawing the chain after ...
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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 coloured compass 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 line of sight 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 planimeter plate plotting plumb-bob plumb-line plummet position protractor represents right angles safety-lamp scale seam shaft side spirit-level square staff station station-line strike and dip surface surface-surveys survey tacheometer tacheometry tangent screw telescope theodolite transit-theodolite traverse triangle tripod tube underground vernier vernier-plate vertical angles wire yards
Popular passages
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Page 25 - Contains the pith of what has been written by the best scholars on the subject. The notes comprise everything that the student can want.
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