A Treatise on Mine-surveying |
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Page viii
... Determination of the meridian by means of the Pole star , 4. Determination of the meridian by means of a map , · Setting out the meridian line , Inclination of the magnetic - needle , CHAPTER V. PAGE 28 29 31 31 22335 31 32 33 35 37 39 ...
... Determination of the meridian by means of the Pole star , 4. Determination of the meridian by means of a map , · Setting out the meridian line , Inclination of the magnetic - needle , CHAPTER V. PAGE 28 29 31 31 22335 31 32 33 35 37 39 ...
Page xii
... Determination of the direction and inclination of a mineral deposit , Determination of a point at the surface directly above one under- 222 ground , 226 · Holing from one excavation to another , 228 Sinking shafts from several levels ...
... Determination of the direction and inclination of a mineral deposit , Determination of a point at the surface directly above one under- 222 ground , 226 · Holing from one excavation to another , 228 Sinking shafts from several levels ...
Page 1
... determine the relative positions of any points on the earth's surface . From such measurements a map , or plan , of any portion of the surface may be drawn , and its area calculated . All surveys are conducted upon nearly the same ...
... determine the relative positions of any points on the earth's surface . From such measurements a map , or plan , of any portion of the surface may be drawn , and its area calculated . All surveys are conducted upon nearly the same ...
Page 7
... determined if the standard should be lost . Two proposals were considered ; one being based on the length of a ... determined . Both these places are in the same meridian as Paris . The measurement was subsequently extended to the Island ...
... determined if the standard should be lost . Two proposals were considered ; one being based on the length of a ... determined . Both these places are in the same meridian as Paris . The measurement was subsequently extended to the Island ...
Page 8
... determined , it ceased to be a natural measure . With the present improvements in measuring - instruments , it is possible for us to determine the circumference of the earth with greater accuracy , whilst the length of the metre is ...
... determined , it ceased to be a natural measure . With the present improvements in measuring - instruments , it is possible for us to determine the circumference of the earth with greater accuracy , whilst the length of the metre is ...
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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