A Treatise on Mine-surveying |
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Results 1-5 of 56
Page 2
... right angles to be set out . This primitive instrument consisted of two straight - edges fastened together at right angles , a pointed vertical staff being fixed to the point of intersection . The two straight - edges were provided at ...
... right angles to be set out . This primitive instrument consisted of two straight - edges fastened together at right angles , a pointed vertical staff being fixed to the point of intersection . The two straight - edges were provided at ...
Page 5
... angle formed with the meridian by the direction of a horizontal line drawn in the middle plane . Its dip is the ... right angles to the chief lodes of any particular mining district . The characteristic feature of beds and seams is ...
... angle formed with the meridian by the direction of a horizontal line drawn in the middle plane . Its dip is the ... right angles to the chief lodes of any particular mining district . The characteristic feature of beds and seams is ...
Page 9
... angle may be defined as the ratios to each other of the sides of a right - angled triangle possessing the given angle . Assuming that A , B , C represent the three angles of a right - angled triangle , C being the right angle , and that ...
... angle may be defined as the ratios to each other of the sides of a right - angled triangle possessing the given angle . Assuming that A , B , C represent the three angles of a right - angled triangle , C being the right angle , and that ...
Page 10
Bennett Hooper Brough. The supplement of an angle is that angle which must be added to it to make two right angles ... right angles , and that the sides of the triangle are proportional to the sines of the opposite angles . right - angled ...
Bennett Hooper Brough. The supplement of an angle is that angle which must be added to it to make two right angles ... right angles , and that the sides of the triangle are proportional to the sines of the opposite angles . right - angled ...
Page 15
... right angles to the chain . The length of the offset having been deter- mined , the position of the object is fixed ... right angle with precision . The cross - staff and optical square , recommended by some surveyors for erecting ...
... right angles to the chain . The length of the offset having been deter- mined , the position of the object is fixed ... right angle with precision . The cross - staff and optical square , recommended by some surveyors for erecting ...
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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