le TIIE THEORY AND PRACTICE OF SURVEYING; CONTAINING All the Instructions requisite for the skilful practice of this art. (135 V 1 ILLUSTRATED BY COPPER-PLATES. THE WHOLE CORRECTED, NEWLY ARRANGED, AND GREATLI ENLARGED, WITH USEFUL SELECTIONS, AND A NEW SET OF ACCURATE MATHEMATICAL TABLES. BY D. P. ADAMS, TEACHER OF THE MATHEMATICS. NEW-YORK: PUBLISHED BY EVERT DUYCKINCK. xo. 110 PEARL-STREET. George Long, printer. 1811. 40 District of New York, ss. BE IT REMEMBERED, that on the twenty-eighth day of March, in the thirty-fifth year of the Independence of the United States of America, Evert Tuyckinck, of the said district, hath deposited in this office the title of a book, the right whereof he claims as proprietor, in the words following, to wit : “ The Theory and Practice of Surveying ; containing all the Instructions requisite for the skilful practice of this Art. By Robert Gibson. Illustrated by Copper-Plates. The whole corrected, newly arranged, and greatly enlarged, with useful Selections, and a new set of accurate Mathematical Tables. By D. P. Adams, Teacher of the Mathematics." In conformity to the act of the Congress of the United States, en. titled “ An act for the encouragement of learning, by securing the copies of maps, charts, and books to the authors and propietors of such copies, during the times therein mentioned.” And also to an act, entitled “ An act, supplementary to an act, entitled an act for the encouragement of learning, by securing the copies of maps, charts, and books to the authors and proprietors of such copies, during the times therein mentioned, and extending the benefits thereof to the arts of designing, engraving, and etching historical and other prints." CHARLES CLINTON, Clerk of the District of New-York Sect. 1. Decimal Fractions 2 Sect. 9. Levelling 284 2. Involution and Evolu. Promiscuous Ques- 296 PART III. 37 298 5. Trigonometry 99 2. Description of Instru- 305 PART II. 3. To find the Latitude by the Meridian AlSect. 1. The Chain 134 titude of the Sun 316 The Circumferentor 152 4. Variation of the Com. The Theodolite 159 pass 318 LIST OF TABLES. 169 Logarithms of Numbers 1 171 Sines, Tangents and Secante 20 2. Mensuration of Natural Sines 71 heighits 179 Points of the Compass 82 Of Distances 194 Traverse Table 83 3. Mensuration of Areas 200 General Method 232 Mean Refraction 174 Pennsylvania Method 246 Sun's Parallax 4. Of off-sets 250 Dip of the Horizon Dip for Dif. Dist of land by Intersections 257 Semi-diameter of the Sun ibid 6. Changing the scale Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and Pole 177 Land 271 Sun's Declination 178 8. Maritime Surveying 281 Reduction Table 182 The Protractor, 175 3. Method of surveying of Maps |