## An Introduction to the Present Practice of Surveying and Levelling ...: With an Appendix, Containing Such Arithmetical Rules and Examples as are Necessary for the Explanation of the Subject |

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3rd angle 5-mile stone arrow back-sights base line bearing bisected bubble called chain angles chainage clamp and tangent collimation columns commenced common denominator cube cube root datum line decimal DECIMAL FRACTION direction distance divided dividend divisor Dumpy Level duodecimal east employed equal error false stations feet fence field field-book fixed fore-sights give given number greatest common measure ground hundredths hypothenusal improper fraction inches instrument last line length long lines lower plate lowest terms Mean reading mile minutes multiplied nautical mile needle observation offsets parallax parallel plate-screws place of figures plotting proposed line protractor quotient railway Reduced level remainder resolvend Rule scale second object sextant side spirit level staff subtract Subtrahend survey surveyor taken taking sights tangent screw telescope theodolite triangles triple square vernier plate vernier scale vertical limb vulgar fraction whole number wires zero