A Treatise on Mine-surveying |
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... Illustrations , 36s . ELEMENTS OF METALLURGY : A Practical Treatise on the Art of Extracting Metals from their Ores . BY J. ARTHUR PHILLIPS , C.E. , F.R.S. , F.C.S. , F.G.S. , Ancien Elève de l'Ecole des Mines , Paris . REWRITTEN AND ...
... Illustrations , 36s . ELEMENTS OF METALLURGY : A Practical Treatise on the Art of Extracting Metals from their Ores . BY J. ARTHUR PHILLIPS , C.E. , F.R.S. , F.C.S. , F.G.S. , Ancien Elève de l'Ecole des Mines , Paris . REWRITTEN AND ...
Page 32
... illustration of the necessity of this change may be afforded by imagining a watch in which the dial - plate moves from left to right , whilst the hand remains immovable . It is evident that the hours must count from right to left for ...
... illustration of the necessity of this change may be afforded by imagining a watch in which the dial - plate moves from left to right , whilst the hand remains immovable . It is evident that the hours must count from right to left for ...
Page 56
... illustrated by an example . In making a survey in the ordinary way with the dial , any error in the readings will cause the next draft to have a false position when plotted . Assuming that a survey is made between the points A and E ...
... illustrated by an example . In making a survey in the ordinary way with the dial , any error in the readings will cause the next draft to have a false position when plotted . Assuming that a survey is made between the points A and E ...
Page 66
... for the following angle . This method of surveying is illustrated by the accompanying notes of a survey of a portion of a Durham colliery : - 100 250 225 365 365 90 90 O 299 160 66 . MINE - SURVEYING . Traversing underground,
... for the following angle . This method of surveying is illustrated by the accompanying notes of a survey of a portion of a Durham colliery : - 100 250 225 365 365 90 90 O 299 160 66 . MINE - SURVEYING . Traversing underground,
Page 126
... illustration of the method of constructing scales , let it be required to construct a scale of 3 chains to the inch , to exhibit 18 chains . Draw a line 6 inches long , and divide it into 18 equal parts . These are the primary divisions ...
... illustration of the method of constructing scales , let it be required to construct a scale of 3 chains to the inch , to exhibit 18 chains . Draw a line 6 inches long , and divide it into 18 equal parts . These are the primary divisions ...
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Common terms and phrases
accuracy accurate adjusted base-line bearing bore-hole brass calculated centre chain City Guilds clamped clinometer coal colliery collimation compass compass-box contour lines cord corner cosec cotan cross-wires curve determined direction distance divided divisions 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 meridian angle 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 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
Popular passages
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