# Elements of Surveying, and Navigation: With Descriptions of the Instruments and the Necessary Tables

A. S. Barnes & Company, 1854 - 322 páginas

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### Contenido

 PLANE SURVEYING 64 Verniers 75 Surveying Cross 81 Of Laying out Land 96 Field Operations 102 Of Balancing the Work 109 First Method of Plotting 117
 Triangulation 178 To Measure a Horizontal Angle 185 Plotting the Triangulation 192 OF NAVIGATION 201 SECTION III 207 SECTION V 214 Mercators Chart 221

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Página 14 - The logarithm of the quotient of two numbers is equal to the logarithm of the dividend minus the logarithm of the divisor.
Página 38 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Página 13 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Página 21 - ... 20. An EQUILATERAL polygon is one which has all its sides equal; an equiangular polygon, is one which has all its angles equal. 21. Two polygons are mutually equilateral, when they have their sides equal each to each, and placed in the same order : that is to say, when following their bounding lines in the same direction, the first side of the one is equal to the first side of the other, the second to the second, the third to the third, and so on. 22. Two polygons are mutually equiangular, when...
Página 16 - The difference of the logarithms, as here used, means the algebraic difference ; so that, if the logarithm of the divisor have a negative characteristic, its sign must be changed to positive, after diminishing it by the unit, if any, carried in the subtraction from the decimal part of the logarithm.
Página 131 - Soon after the organization of the present government, several of the states ceded to the United States large tracts of wild land, and these together with the lands since acquired by treaty and purchase, constitute what is called the public lands or public domain. Previous to the year 1802 these lands were parcelled out without reference to any general plan, in consequence of which the titles often conflicted with each other, and in many cases, several grants .covered the same premises. In the year...
Página 92 - Then, find the areas of the triangles separately, and their sum will be the area of the quadrilateral.
Página 39 - The tangent of an arc is the line which touches it at one extremity, and is limited by a line drawn through the other extremity and the centre of the circle. Thus, AC is the tangent of the arc AB.
Página 24 - B + 0, the product would be indicated thus; (A+D)x(A-B+C), whatever is enclosed within the curved lines, being considered as a single quantity. The same thing may also be indicated by a bar : thus, A+B+OXD, denotes that the sum of A, B and C, is to be multiplied by D.