## Elements of surveying and navigation: with descriptions of the instruments and the necessary tables |

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### Common terms and phrases

axis back-sight base line called centre clamp-screw column comp compass contour lines Cosine Cotang course decimal degrees describe determined difference of latitude difference of level direction divided double meridian distance draw east error example feet figure fore-sight given angle given line given point ground half hence horizontal angle horizontal distance horizontal line horizontal plane inches instrument intersection latitude and departure length line of collimation logarithm longitude marked measure method miles multiplied needle object parallel PARALLEL SAILING passing perpendicular plane of reference plane sailing plane triangle plot protractor quotient radius right angles right-angled triangle rods sailing scale of equal screws secant sides sights sine spherical excess spider's lines square chains staff subtract surface survey Tang tangent theodolite variation vernier plate vertical limb yards