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

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Page 140

... and let the board be slipped up or down , until the pole - star can be- seen

... and let the board be slipped up or down , until the pole - star can be- seen

**through the hole . The light reflected from the paper will show the cross hairs in the telescope of the theodolite**. Then , let the vertical spider's line ...### What people are saying - Write a review

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### Common terms and phrases

angle axis base line bearing called centre chords circle column correction corresponding Cosine Cotang course decimal departure describe designated determined difference direction distance divided division draw drawn east equal error example extremity feet field figure given gives greater ground half hence horizontal horizontal line inch intersection known land latitude length less limb logarithm longitude manner marked means measure meridian method middle miles minutes multiplied notes object opposite parallel passing perpendicular plane plate position radius reading remaining REMARK represent right angles sailing scale screws ship sides sights Sine square staff station straight subtract suppose surface survey taken Tang tangent telescope third triangle true turn unit variation vernier vertical yards

### Popular passages

Page 14 - The logarithm of the quotient of two numbers is equal to the logarithm of the dividend minus the logarithm of the divisor.

Page 38 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...

Page 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.

Page 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...

Page 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.

Page 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...

Page 92 - Then, find the areas of the triangles separately, and their sum will be the area of the quadrilateral.

Page 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.

Page 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.

Page 19 - The minutes in the left.hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.