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Parts Common to Several Instruments
Chain Surveying Instruments
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accuracy adjusting screws alidade angular backsight balancing line bearing bubble calculation centre line chain chainage chord clamp clinometer co-ordinates compass constant contour lines contours correction cross sections curvature curve datum deflection angles direction distance dumpy level elevation eyepiece field fixed float focussing gauge glass graduated ground instrument station intersection interval latitude length lens level tube levelling screws line of sight located lunitidal interval mark means measured ment meridian method necessary needle object observations obtained offsets orientation parallel perpendicular plane table plate plotting pole position prismoid radius Ramsden eyepiece range rays reading rotation scale sextant side slope spirit level stadia hairs staff straight stream surface survey line surveyor tacheometer tacheometry tangent screw tape telescope theodolite tide tion transit traverse triangle usually velocity vernier versin vertical angles vertical axis vertical circle zero