A Treatise on Mine-surveying |
From inside the book
Results 1-5 of 59
Page x
... magnetic - needle , ( b . ) Spirit - levels , ( c . ) The tripod , . · ( 1. ) Taking underground observations with the dial , Taking vertical angles , Keeping the dialling - book , ( 2. ) Surface - surveys with the miner's dial , ( 3 ...
... magnetic - needle , ( b . ) Spirit - levels , ( c . ) The tripod , . · ( 1. ) Taking underground observations with the dial , Taking vertical angles , Keeping the dialling - book , ( 2. ) Surface - surveys with the miner's dial , ( 3 ...
Page xiii
... magnetic - needle , • 184 184 • 184 188 191 193 193 195 CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGR Theory CONTENTS . xiii.
... magnetic - needle , • 184 184 • 184 188 191 193 193 195 CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGR Theory CONTENTS . xiii.
Page xv
... MAGNETIC - NEEDLE IN MINING . PAGE 237 239 241 246 246 249 250 251 252 253 254 255 258 258 258 258 • 258 259 260 262 ... magnetic - needle in surveying bore - holes , . 276 Employment of a powerful magnet in cases of uncertain holing ...
... MAGNETIC - NEEDLE IN MINING . PAGE 237 239 241 246 246 249 250 251 252 253 254 255 258 258 258 258 • 258 259 260 262 ... magnetic - needle in surveying bore - holes , . 276 Employment of a powerful magnet in cases of uncertain holing ...
Page 4
... magnetic - needle , according to which mining plans are almost invariably constructed . It is too often the case when mines are worked by companies , that the shareholders are so regardless of what does not , as they conceive , lead to ...
... magnetic - needle , according to which mining plans are almost invariably constructed . It is too often the case when mines are worked by companies , that the shareholders are so regardless of what does not , as they conceive , lead to ...
Page 26
... magnetic - needle has long been employed . The action of the earth on a magnetic - needle is directive , that is , it determines the position of the needle with relation to the cardinal points of the horizon , but causes no strain on ...
... magnetic - needle has long been employed . The action of the earth on a magnetic - needle is directive , that is , it determines the position of the needle with relation to the cardinal points of the horizon , but causes no strain on ...
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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
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