A Treatise on Mine-surveyingC. Griffin & Company, 1896 - 334 páginas |
Contenido
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Términos y frases comunes
accuracy accurate adjusted alidade ball and socket base-line bearing brass calculated centre chain City Guilds clamped clinometer colliery collimation compass compass-box contour lines cord corner cosec cross-wires determined direction distance divided divisions dumpy level employed Engineer equal error EXETER STREET fathoms feet fixed graduated ground height hole horizontal circle inches in diameter inclination instrument intersection iron lamp latitude length lode magnetic bearing magnetic declination magnetic meridian magnetic-needle marked means measured meridian angle method metres mine-surveying miner's dial mines needle observed obtained offsets parallel parallel ruler perpendicular placed plane planimeter plate plotting plumb-bob plumb-line plummet position protractor right angles safety-lamp scale seam shaft side Silver King spirit-level square staff station station-line surface surface-surveys survey surveyor tacheometer taken tangent screw telescope theodolite traverse triangle tripod underground vernier vernier-plate vertical angles vertical arc vertical axis wire zero
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