Elements of Surveying, and Navigation: With Descriptions of the Instruments and the Necessary Tables |
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Page vii
... Base Line , - 176 Triangulation , .. - - 178 Filling up the Survey , 181 Use of the Compass , - 181 The Plane Table - Its Uses , - - - 183 To Measure a Horizontal Angle , .. 185 To Determine Lines in Extent and Position ,. 185 Of ...
... Base Line , - 176 Triangulation , .. - - 178 Filling up the Survey , 181 Use of the Compass , - 181 The Plane Table - Its Uses , - - - 183 To Measure a Horizontal Angle , .. 185 To Determine Lines in Extent and Position ,. 185 Of ...
Page 55
... base line AB , and select the stations A and B , in such a man- ner that each can be seen from the other , and the point C from both of them . Then measure the hori- zontal angles CAB and CBA , with an instrument adapted to that purpose ...
... base line AB , and select the stations A and B , in such a man- ner that each can be seen from the other , and the point C from both of them . Then measure the hori- zontal angles CAB and CBA , with an instrument adapted to that purpose ...
Page 56
... base line , as BA ; and at the extremities B and A , measure the horizontal angles CBA and CAB . Measure also the angle of elevation DBC . Then in the triangle CBA there will be known , two angles and the side AB ; the side BC can ...
... base line , as BA ; and at the extremities B and A , measure the horizontal angles CBA and CAB . Measure also the angle of elevation DBC . Then in the triangle CBA there will be known , two angles and the side AB ; the side BC can ...
Page 58
... base line AB in the direction of the object D. Then measure with the instrument the angles of elevation at A and B. Then , since the out- ward angle DBC is equal to the sum of the angles A and ADB , it follows that the an- D gle ADB is ...
... base line AB in the direction of the object D. Then measure with the instrument the angles of elevation at A and B. Then , since the out- ward angle DBC is equal to the sum of the angles A and ADB , it follows that the an- D gle ADB is ...
Page 59
... base line AB , and at the stations A and B conceive the two horizontal lines AC , BC , to be drawn . The C A oblique lines from A and B to the object are the hy- pothenuses of two right - angled triangles , of which AC , BC , are the ...
... base line AB , and at the stations A and B conceive the two horizontal lines AC , BC , to be drawn . The C A oblique lines from A and B to the object are the hy- pothenuses of two right - angled triangles , of which AC , BC , are the ...
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Common terms and phrases
axis back-sight base line bearing called centre column comp Cosine Cosine D course decimal degrees determined diff difference of latitude difference of level direction divided double meridian distance draw east error example feet figure fore-sight given angle given line given point half hence horizontal distance horizontal line hypothenuse inch instrument intersection LatDegDegDegDeg length limb line of collimation logarithm longitude M.
M. Sine marked measure method middle latitude miles multiplied paper parallel PARALLEL SAILING perpendicular plane of reference plane sailing plane triangle protractor quotient radius right angles right-angled triangle rods sailing scale of chords scale of equal screws secant sector sides sights Sine Cotang Sine D spherical excess spider's lines square chains staff station straight line subtract surface survey Tang tangent telescope theodolite trigonometrical vernier plate 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 42 - 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 25 - ... 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 20 - 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 135 - 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 96 - Then, find the areas of the triangles separately, and their sum will be the area of the quadrilateral.
Page 43 - 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 28 - 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 1 - 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.