## A Treatise on Surveying, Containing the Theory and Practice: To which is Prefixed a Perspicuous System of Plane Trigonometry. The Whole Clearly Demonstrated and Illustrated by a Large Number of Appropriate Examples, Particularly Adapted to the Use of Schools |

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ABCD acres adjacent adjacent angles angle opposite angles ABC base bearings and distances Calculation centre changed bearing Co-secant Secant Co-sine Co-tang column compass corresponding decimal Degrees Demonstration describe the arc diff difference of latitude dist divide division line draw east equal EXAMPLES feet figures find the angles find the area fourth term given angle given area given bearing given number given side Given the bearings Hence hypothenuse JOHN GUMMERE latitude and departure length line FE logarithm measured meridian multiplier natural number off-sets ooooo parallelogram parture perches perpendicular place of beginning pole star prob quired quotient radius rectangle Required the area right angle right-angled triangle RULE side AC Sine square root station stationary lines subtract survey take the difference Tangent tract of land trapezium triangle ABC trigonometry two-pole chains