A Treatise on Mine-surveyingGriffin, 1888 - 302 sider |
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Side 11
... wire , each bent at the end into a ring , and connected with the ring at the end of the next piece by means of three rings . The chain is thus prevented from becoming twisted or kinked . A couple of swivels are also inserted in the ...
... wire , each bent at the end into a ring , and connected with the ring at the end of the next piece by means of three rings . The chain is thus prevented from becoming twisted or kinked . A couple of swivels are also inserted in the ...
Side 12
... ten arrows or iron pins , which are used in succession to mark the end of the chain in measuring a line . They are a foot long , and are made of stout iron wire sharpened at one end and bent into a ring at 12 MINE - SURVEYING .
... ten arrows or iron pins , which are used in succession to mark the end of the chain in measuring a line . They are a foot long , and are made of stout iron wire sharpened at one end and bent into a ring at 12 MINE - SURVEYING .
Side 22
... wire is soldered across the tape , the white solder extending about an inch on each side of the wire . In the latter is filed a small notch which marks the exact spot where the tenth foot ends . The distances from the zero point of the ...
... wire is soldered across the tape , the white solder extending about an inch on each side of the wire . In the latter is filed a small notch which marks the exact spot where the tenth foot ends . The distances from the zero point of the ...
Side 28
... wire . In the lower divisions , the relative positions of the slit and wire are changed . The compass - box is attached to a tripod- stand by a socket fitting on to a corresponding plug ; an inter- mediate ball and socket joint ...
... wire . In the lower divisions , the relative positions of the slit and wire are changed . The compass - box is attached to a tripod- stand by a socket fitting on to a corresponding plug ; an inter- mediate ball and socket joint ...
Side 30
... wire round the edge . The surveyor should therefore examine both his watch and his hat before commencing a survey . Sometimes the needle persistently sticks to the under side of the glass . This is caused by the glass becoming ...
... wire round the edge . The surveyor should therefore examine both his watch and his hat before commencing a survey . Sometimes the needle persistently sticks to the under side of the glass . This is caused by the glass becoming ...
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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