Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 72
... intersection of the spider's lines . If the highest degree of accuracy is necessary , the base line should be measured with rods , which admit of being adjusted to a horizontal position by means of a spirit level . APPLICATIONS . 1 ...
... intersection of the spider's lines . If the highest degree of accuracy is necessary , the base line should be measured with rods , which admit of being adjusted to a horizontal position by means of a spirit level . APPLICATIONS . 1 ...
Page 127
... true meridian of a place , is by observing the north star . If this produced , pierces the heavens , then , the intersection star were precisely at the point in which the axis of the earth , WITH THE COMPASS . 127 Variation of the Needle,
... true meridian of a place , is by observing the north star . If this produced , pierces the heavens , then , the intersection star were precisely at the point in which the axis of the earth , WITH THE COMPASS . 127 Variation of the Needle,
Page 128
... intersection of the vertical plane passing through it and the place , with the sur- face of the earth , would be the true meridian . But , the star being at a distance from the pole , equal to 1 ° 34 ′ nearly , it performs a revolution ...
... intersection of the vertical plane passing through it and the place , with the sur- face of the earth , would be the true meridian . But , the star being at a distance from the pole , equal to 1 ° 34 ′ nearly , it performs a revolution ...
Page 140
... intersection of the spider's lines , within the barrel of the telescope , ought to coincide , FIRST ADJUSTMENT . * To fix the intersection of the spider's lines in the axis of the telescope . Having screwed the tripod to the instrument ...
... intersection of the spider's lines , within the barrel of the telescope , ought to coincide , FIRST ADJUSTMENT . * To fix the intersection of the spider's lines in the axis of the telescope . Having screwed the tripod to the instrument ...
Page 141
... intersection of the spider's lines . Having done this , revolve the telescope in the Y's , half round , when the attached level CD will come to the upper side . See if , in this position , the horizontal hair appears above or below the ...
... intersection of the spider's lines . Having done this , revolve the telescope in the Y's , half round , when the attached level CD will come to the upper side . See if , in this position , the horizontal hair appears above or below 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 DegDeg Distance 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 half hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDeg LatDegDegDegDeg Distance latitude and departure length levelling screws line AC line of collimation logarithm marked measure multiplied natural sines paper parallel passing perpendicular plane of reference protractor radius right angles rods scale of equal secant side sights similar triangles Sine D Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards