Field Work and Instruments
New York, 1900 - Surveying - 279 pages
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Common terms and phrases
accuracy accurately adjustment altitude attached bisect box sextant centre chain circle circular circumferentor clamped clinometer coincide compass-box correct cross staff cross-hair curve diaphragm direction distance divisions dumpy level edge equal error eye-piece FICURE fixed glass gradient graduated Gunter's chains half head horizontal angles illustration indicated instru instrument left hand length level staff limb line of collimation line of sight longitudinal bubble magnetic meridian makers marked E means measured ment mirror move needle object viewed object-glass observed obtained opposite optical square parallax parallel plate screws perpendicular placed plumb-bob pole position shown primary scale refraction reversed revolving right angles round screws marked shown in fig side sight-vane sliding socket spirit level staff readings surface surveying surveyor tacheometer tangent screw tangential angle telemeter telescope theodolite traverse tripod Troughton & Simms trunnion tube turned vane vernier plate vernier scale vertical axis wires zero