A Treatise on Mine-surveying |
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Results 1-5 of 79
Page x
... 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 28 29 23 3 0 0 0 0 co 31 31 31 ...
... 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 28 29 23 3 0 0 0 0 co 31 31 31 ...
Page xi
... Repetition , · Measurement of vertical angles , The solar attachment , . PAGE 60 60 61 62 63 64 65 66 74 74 77 77 78 79 80 80 82 84 138885 89 89 90 92 93 94 96 97 98 99 CHAPTER IX . TRAVERSING UNDERGROUND . · Use of the CONTENTS . xi.
... Repetition , · Measurement of vertical angles , The solar attachment , . PAGE 60 60 61 62 63 64 65 66 74 74 77 77 78 79 80 80 82 84 138885 89 89 90 92 93 94 96 97 98 99 CHAPTER IX . TRAVERSING UNDERGROUND . · Use of the CONTENTS . xi.
Page 2
... vertical staff being fixed to the point of intersection . The two straight - edges were provided at each extremity with sight vanes , from which plumb - lines were suspended so as to enable the instrument to be levelled . With Hero's ...
... vertical staff being fixed to the point of intersection . The two straight - edges were provided at each extremity with sight vanes , from which plumb - lines were suspended so as to enable the instrument to be levelled . With Hero's ...
Page 11
... vertical , or inclined . The measurement of horizontal lines is of the most frequent occurrence . When a line inclined towards the horizon has to be measured , the operation is , as a rule , performed with the object of determining the ...
... vertical , or inclined . The measurement of horizontal lines is of the most frequent occurrence . When a line inclined towards the horizon has to be measured , the operation is , as a rule , performed with the object of determining the ...
Page 30
... vertical plane , and the variable eccentricity , when the centre pin is eccen- tric to the graduated circle , may be detected by the readings at the two ends of the needle not agreeing . In both cases the error may be corrected by ...
... vertical plane , and the variable eccentricity , when the centre pin is eccen- tric to the graduated circle , may be detected by the readings at the two ends of the needle not agreeing . In both cases the error may be corrected by ...
Contents
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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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