A Treatise on Mine-surveying |
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Page ix
... telescope , . Various forms .- ( a . ) Hoskold's transit - theodolite , ( b . ) The Everest theodolite , ( c . ) The Hoffman tripod head , ( d . ) American theodolites , ( e . ) Traveller's transit - theodolite , Adjustments of the ...
... telescope , . Various forms .- ( a . ) Hoskold's transit - theodolite , ( b . ) The Everest theodolite , ( c . ) The Hoffman tripod head , ( d . ) American theodolites , ( e . ) Traveller's transit - theodolite , Adjustments of the ...
Page xi
... needle , PAGE 147 148 151 151 152 152 153 153 153 . 154 154 156 158 162 167 170 170 170 171 172 174 177 177 179 182 184 • 184 184 188 191 193 193 195 CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGE Theory CONTENTS . xi.
... needle , PAGE 147 148 151 151 152 152 153 153 153 . 154 154 156 158 162 167 170 170 170 171 172 174 177 177 179 182 184 • 184 184 188 191 193 193 195 CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGE Theory CONTENTS . xi.
Page xii
Bennett Hooper Brough. CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGE Theory of telescopic measurement , 199 Calculations , 204 The protractor , The tacheometer , The staves , The field - work , The topographical stadia , 204 205 ...
Bennett Hooper Brough. CHAPTER XV . MEASURING DISTANCES BY TELESCOPE . PAGE Theory of telescopic measurement , 199 Calculations , 204 The protractor , The tacheometer , The staves , The field - work , The topographical stadia , 204 205 ...
Page 45
... telescope moved vertically until it is brought to bear upon a fixed star of the first or second magnitude several hours before its culmination . As soon as the star passes the cross - wires of the telescope , the latter is clamped , and ...
... telescope moved vertically until it is brought to bear upon a fixed star of the first or second magnitude several hours before its culmination . As soon as the star passes the cross - wires of the telescope , the latter is clamped , and ...
Page 46
... telescope was brought to bear on a signal on the top of the tower of Clausthal Church . The following observations were then made with the stars 6 and y Virginis : - ALTITUDE OF THE STAR . READINGS ON THE HORIZONTAL CIRCLE CALCULATED ...
... telescope was brought to bear on a signal on the top of the tower of Clausthal Church . The following observations were then made with the stars 6 and y Virginis : - ALTITUDE OF THE STAR . READINGS ON THE HORIZONTAL CIRCLE CALCULATED ...
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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