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THEORY AND PRACTICE

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L - - - or EAGHER of THE MATHE MATIcs.
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Bistrict of Mew-York, ss. BE IT REMEMBERE D, that on the twenty-eighth day of March, in the thirty-fifth year of the Independence of the United States of America, Evert Duyckinck, 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 anew 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, entitled “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 JNew-Yorks

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PART I. Page. PART II. Page.

Sect. 1. Decimal Fractions 2 |Sect. 9. Levelling 284

2. Involution and Evolu- Promiscuous Ques-

tion 15 :----- 295

3. Of Logarithms 23

4. Elements of Geome- PART III.

try . 37 -

Mathematical Instru-_ |Sect. 1. Introductory Princi.
Inents 74 ples 298
5. Trigonometry 99 2. Description of Instru-
onents 305
PART II. 3. To find the Latitude
by the Meridian Al-

Sect. 1. The Chain 134 titude of the Sun 316

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The Theodolite 159 pass S13

The Semicircle 164

Mensuration of An- LIST OF TABLES.
gles by these In-
Struments 169 |Logarithms of Numbers I
The Protractor, 171 Sines, Tangents and secants 20
2. Mensuration of Natural Sines 71
heights 179 |Points of the Compass 82
Of Distances 194 |Traverse Table 83

3. Mensuration of Areas 200

General Method 23? |Mean Refraction (174

Pennsylvania Method 246 |Sun's Parallax
4. Of Off-sets 250 |Dip of the Horizon : 175
5. Method of surveying Dip for Dif. Dist of land
by Intersections 257 Semi-diameter of the sun ibid

6. Changing the scale Transit of Pole Star 176

of Maps 263 |Difference of Altitude of

7. Method of Dividing Pole Star and Pole 177

Land 271 Sun’s Declination 178

o 8. Maritime Surveying 281 WReduction table 182

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