Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 67
... base line AB , and select the stations A and B , in such a manner that each can be seen from the other , and the point C from both of them . Then measure the horizontal angles CAB and CBA . B Let us suppose that we have found AB = 600 ...
... base line AB , and select the stations A and B , in such a manner that each can be seen from the other , and the point C from both of them . Then measure the horizontal angles CAB and CBA . B Let us suppose that we have found AB = 600 ...
Page 68
... base line , as BA ; and at the ex- tremities 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 ex- tremities 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 70
... base line AB in the direction of the object D. To do this , it will be well to A 不 place the theodolite at A , and range the chain staves by means of the upper telescope . Having measured the base , measure with the instrument the ...
... base line AB in the direction of the object D. To do this , it will be well to A 不 place the theodolite at A , and range the chain staves by means of the upper telescope . Having measured the base , measure with the instrument the ...
Page 71
... base line AB , and at the stations A and B conceive the two horizontal lines AC , BC , to be drawn . The oblique lines from A and B to the object will be the hypothenuses 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 oblique lines from A and B to the object will be the hypothenuses of two right - angled triangles , of which AC , BC , are the ...
Page 72
... base line , if great accuracy is required , the theodolite should be placed at one extremity , and the telescope directed to the other , and the alignment of the staves made by means of the intersection of the spider's lines . If the ...
... base line , if great accuracy is required , the theodolite should be placed at one extremity , and the telescope directed to the other , and the alignment of the staves made by means of the intersection of the spider's lines . If the ...
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Common terms and phrases
adjusted angle of elevation axis azimuth back-sights base line called centre clamp-screw coincide column comp compass Cosine D Cosine Sine Cotang course curve decimal degrees determined difference of level direction divided double meridian distance draw east elongation error example feet field notes figure given angle given line given point ground Gunter's chain hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg Distance latitude and departure length line AC line of collimation logarithm M.
M. Sine marked measure multiplied natural sines object opposite station paper parallel passing perpendicular plane of reference protractor radius right angles right-angled triangle rods scale of equal secant side sights similar triangles Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards
Popular passages
Page 12 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Page 41 - In any triangle, the sum of the two sides containing either angle, is to their difference, as the tangent of half the sum of the two other angles, to the tangent of half their difference.
Page 73 - Being on a horizontal plane, and wanting to ascertain the height of a tower, standing on the top of an inaccessible hill, there were measured, the angle of elevation of the top of the hill 40°, and of the top of the tower 51° ; then measuring in a direct line 180 feet farther from the hill, the angle of elevation of the top of the tower Cway 33° 45' ; required the height of the tower.
Page 113 - B, from B to C, from C to D, from D to E, and from E to A ; and measure the distances AB, BC, CD, DE, and E.1.
Page 19 - ... perimeter of the polygon. 14. The polygon of three sides, the simplest of all, is called a triangle; that of four sides, a quadrilateral; that of...
Page 34 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Page 21 - If equals be added to equals, the wholes will be equal. 3. If equals be taken, from equals, the remainders will be equal. 4. If equals be added to unequals, the wholes will be unequal.
Page 20 - And lastly, the trapezoid, only two of whose sides are parallel. 18. A diagonal is a line which joins the vertices of two angles not adjacent to each other. Thus, AF, AE, AD, AC, are diagonals.
Page 11 - 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.
Page 35 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, OC is the secant of the arc AB.