A Treatise on Mine-surveying |
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Page x
... observations with the dial , Taking vertical angles , Keeping the dialling - book , ( 2. ) Surface - surveys with the miner's dial , ( 3. ) Colliery - surveys with the miner's dial , CHAPTER IV . THE VARIATION OF THE MAGNETIC - NEEDLE ...
... observations with the dial , Taking vertical angles , Keeping the dialling - book , ( 2. ) Surface - surveys with the miner's dial , ( 3. ) Colliery - surveys with the miner's dial , CHAPTER IV . THE VARIATION OF THE MAGNETIC - NEEDLE ...
Page 4
... observation or notice of the variation of the 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 ...
... observation or notice of the variation of the 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 ...
Page 19
... observations made on those sides respectively of the station - line . The middle column represents the chain . It is , therefore , advisable to begin the entries at the bottom of the page ; the chain and field - book being thus placed ...
... observations made on those sides respectively of the station - line . The middle column represents the chain . It is , therefore , advisable to begin the entries at the bottom of the page ; the chain and field - book being thus placed ...
Page 29
... a piece of iron near it when at rest , observing whether it returns exactly to its former position after a few oscillations . The test should be made at several points round the THE MINER'S DIAL . 29 (a ) The magnetic-needle,
... a piece of iron near it when at rest , observing whether it returns exactly to its former position after a few oscillations . The test should be made at several points round the THE MINER'S DIAL . 29 (a ) The magnetic-needle,
Page 30
... observation . The constant eccentricity , when the centre pin and the ends of the needle are not in one vertical plane , and the variable eccentricity , when the centre pin is eccen- tric to the graduated circle , may be detected by the ...
... observation . The constant eccentricity , when the centre pin and the ends of the needle are not in one vertical plane , and the variable eccentricity , when the centre pin is eccen- tric to the graduated circle , may be detected by the ...
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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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