A Treatise on Mine-surveying |
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Results 1-5 of 31
Page ix
... Adjustments of the theodolite , Measuring horizontal angles , Repetition , Measurement of vertical angles , The solar attachment , . 85 85 88 89 89 90 92 93 94 96 97 98 99 CHAPTER IX . TRAVERSING UNDERGROUND . • Use of the CONTENTS . ix.
... Adjustments of the theodolite , Measuring horizontal angles , Repetition , Measurement of vertical angles , The solar attachment , . 85 85 88 89 89 90 92 93 94 96 97 98 99 CHAPTER IX . TRAVERSING UNDERGROUND . • Use of the CONTENTS . ix.
Page xi
... adjustments of the level , ( d . ) Cushing's reversible level , The levelling - staff , Mine levelling - staves , Practice of levelling , Section levelling , Bench marks , • ( e . ) The reflecting level , Sources of error in spirit ...
... adjustments of the level , ( d . ) Cushing's reversible level , The levelling - staff , Mine levelling - staves , Practice of levelling , Section levelling , Bench marks , • ( e . ) The reflecting level , Sources of error in spirit ...
Page 12
... adjusted before the commencement of every survey , or at any rate from time to time . This is best done by having a standard marked on a level path- way or on the top of a wall , showing not only the accurate length of the chain , but ...
... adjusted before the commencement of every survey , or at any rate from time to time . This is best done by having a standard marked on a level path- way or on the top of a wall , showing not only the accurate length of the chain , but ...
Page 23
... adjusted with facility to long or short steps . The usual step is the military pace of 30 inches , 108 of these paces per minute representing a velocity of 3.07 miles an hour . If no unfavourable conditions come into play , for example ...
... adjusted with facility to long or short steps . The usual step is the military pace of 30 inches , 108 of these paces per minute representing a velocity of 3.07 miles an hour . If no unfavourable conditions come into play , for example ...
Page 31
... adjusted that when the bubbles are in the centres of the tubes , the dial is level . Spirit - levels are usually filled with alcohol or ether . The bubble , being specifically lighter than the liquid , always assumes the highest ...
... adjusted that when the bubbles are in the centres of the tubes , the dial is level . Spirit - levels are usually filled with alcohol or ether . The bubble , being specifically lighter than the liquid , always assumes the highest ...
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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