A Treatise on Mine-surveying |
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Results 1-5 of 68
Page 2
... gives rules for the calcula- tion of areas of triangles , trapezoids , and circles . That the important mines of the ancient Greeks necessitated the solution of mine - surveying problems is shown by the fact that such problems are fully ...
... gives rules for the calcula- tion of areas of triangles , trapezoids , and circles . That the important mines of the ancient Greeks necessitated the solution of mine - surveying problems is shown by the fact that such problems are fully ...
Page 4
... give all the information that can be laid down on paper , a deficiency of surface - objects by which the workings can at a future day be referred to their proper position , and ( what may sometimes lead to the most fatal errors ) a ...
... give all the information that can be laid down on paper , a deficiency of surface - objects by which the workings can at a future day be referred to their proper position , and ( what may sometimes lead to the most fatal errors ) a ...
Page 9
... give the most important relations amongst the trigonometrical functions of the angle A : - 1 sin A = = cosec A √1 - cos2 A tan A = sec A cos A = 1 sec A = √1 − sin2 A cotan A = cosec A tan A = 1 cotan A = / sec2 A 1 sin A - = cos A ...
... give the most important relations amongst the trigonometrical functions of the angle A : - 1 sin A = = cosec A √1 - cos2 A tan A = sec A cos A = 1 sec A = √1 − sin2 A cotan A = cosec A tan A = 1 cotan A = / sec2 A 1 sin A - = cos A ...
Page 13
... gives the total length of the line measured . If the ground is so hard that an arrow cannot be driven in , the leader marks the ground and lays the arrow down . Eleven arrows are usually pre- ferred . The eleventh is used to mark the ...
... gives the total length of the line measured . If the ground is so hard that an arrow cannot be driven in , the leader marks the ground and lays the arrow down . Eleven arrows are usually pre- ferred . The eleventh is used to mark the ...
Page 15
... gives the length of the horizontal distance . The most convenient method is by means of a correction to be deducted from each chain . This correction , being known , may be applied mechanically during the chaining by pulling the chain ...
... gives the length of the horizontal distance . The most convenient method is by means of a correction to be deducted from each chain . This correction , being known , may be applied mechanically during the chaining by pulling the chain ...
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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