Practical geodesy |
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accuracy adjacent angles adjustment adopted altitude angle of elevation argand lamp ascertained atmosphere axis barometer base boundary brass bar Butser Hill calculated centre chain clamped column construction contour lines correction cross wires datum degree depression described determined difference direction distance earth equal error extremities Fahrenheit feet field-book fixed fore sight given Gooty ground height Hill horizontal lines hypotenuse inch inclination inclosure intersection Kit Hill length line of collimation marked means measured mercury meridian method mile normal contours object observed obtained offsets operations parallax parallel parish pickets placed plane plotting pole pole star position protractor purpose quantity railway reading reduced reference refraction rhombus right angles road rods screws sextant shade sides signals spirit-level staff standard station line straight line surface surveyor taken telescope temperature theodolite tion traced triangles Trigonometrical Survey vernier Vernier Scale vertical arc yards