Elements of Surveying and Navigation: With Descriptions of the Instruments and the Necessary Tables |
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Page 70
... axes , to relieve the screw L of the pressure which would otherwise be occasioned by working it . Directly above the clamp , is the lower telescope ... axis of will be explained under the head compass . 70 [ BOOK IL ELEMENTS OF SURVEYING .
... axes , to relieve the screw L of the pressure which would otherwise be occasioned by working it . Directly above the clamp , is the lower telescope ... axis of will be explained under the head compass . 70 [ BOOK IL ELEMENTS OF SURVEYING .
Page 71
... axis of the vertical semicircle UV and the upper telescope , with its attached level , rests on the vernier plate ... axis . In the telescopes attached to the theodolite , are two principal lenses , one at each end . The one at the end ...
... axis of the vertical semicircle UV and the upper telescope , with its attached level , rests on the vernier plate ... axis . In the telescopes attached to the theodolite , are two principal lenses , one at each end . The one at the end ...
Page 72
... axis of the telescope . Having screwed the tripod to the instrument , extend the legs , and place them firmly . Then loosen the clamp- screw S of the vernier plate , and direct the telescope to a small , well - defined , and distant ...
... axis of the telescope . Having screwed the tripod to the instrument , extend the legs , and place them firmly . Then loosen the clamp- screw S of the vernier plate , and direct the telescope to a small , well - defined , and distant ...
Page 73
... axis of the tube is horizontal ; but if not , it is inclined , the bubble being at the elevated end . In that case ... axis of the level is then horizontal . Let the telescope be now revolved in the Y's . If the bubble con- tinue in the ...
... axis of the tube is horizontal ; but if not , it is inclined , the bubble being at the elevated end . In that case ... axis of the level is then horizontal . Let the telescope be now revolved in the Y's . If the bubble con- tinue in the ...
Page 74
... axis of the instrument vertical , and hence , the axes of the levels will be perpendicular to the axis of the instrument . FOURTH ADJUSTMENT . To make the axis of the vertical limb perpendicular to the axis of the instrument . Bring the ...
... axis of the instrument vertical , and hence , the axes of the levels will be perpendicular to the axis of the instrument . FOURTH ADJUSTMENT . To make the axis of the vertical limb perpendicular to the axis of the instrument . Bring the ...
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Common terms and phrases
axis back-sight base line bearing called centre column comp corresponding Cosine Cosine D Cotang 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 horizontal plane 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 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 10 - The logarithm of . the quotient of two numbers, is equal to the logarithm of the dividend diminished by the logarithm of the divisor.
Page 38 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Page 61 - 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 was 33° 45' ; required the height of the tower.
Page 1 - O's, to catch the eye, and to indicate that from thence the two figures of the Logarithm to be taken from the second column, stand in the next line below. N. Log. N. Log. N. Log. N. Log. 1 2 3 4 5 o.
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...
Page 113 - Longitude of the preceding course^ plus the Departure of that course, plus the Departure of the course itself* The Double Longitude of the last course (as well as of the first) is equal to its Departure. Its "coming out" so, when obtained by the above rule, proves the accuracy of the calculation of all the preceding Double Longitudes.
Page 9 - THE LOGARITHM: of a number is the exponent of the power to which it is necessary to raise a fixed number, to produce the given number.
Page 17 - 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 39 - 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, . 00 is the secant of the arc AB.
Page 142 - Now, if the elongation, at the time of observation, was west, and the north end of the needle is on the west side of the line, the azimuth, plus the angle shown by the needle, is the true variation. But should the north end of the needle be found on the east side of the line, the elongation being west, the difference between the azimuth and the angle would show the variation, and the reverse when the elongation is east. 1. Elongation west, azimuth 2° 04' North end of the needle on the west, angle...