THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 52
... elevations and depressions , have been contrived for topographical surveys ; but the graphic re- presentation of the successive gradations of level by means of horizontal lines , as at present employed in the Coast Survey , gives the ...
... elevations and depressions , have been contrived for topographical surveys ; but the graphic re- presentation of the successive gradations of level by means of horizontal lines , as at present employed in the Coast Survey , gives the ...
Página 53
... elevations over the face of the country . As each curve has equal vertical ordinates at all points , the elevation or profile of a hill , as well as a model in relief , can be constructed directly from the map when it is accurately ...
... elevations over the face of the country . As each curve has equal vertical ordinates at all points , the elevation or profile of a hill , as well as a model in relief , can be constructed directly from the map when it is accurately ...
Página 54
... elevation for the location of the contours , recourse to the level is indispensable . With the beginner the observations for elevation can hardly be too frequent , and he should constantly bear this in 54 THE PLANE - TABLE AND ITS USE IN.
... elevation for the location of the contours , recourse to the level is indispensable . With the beginner the observations for elevation can hardly be too frequent , and he should constantly bear this in 54 THE PLANE - TABLE AND ITS USE IN.
Página 55
... elevation should be taken , as well as the heights of such other prominent points or objects as may be commanded from it . Then in using these in working by resection , the topographer has necessarily as many points of reference for the ...
... elevation should be taken , as well as the heights of such other prominent points or objects as may be commanded from it . Then in using these in working by resection , the topographer has necessarily as many points of reference for the ...
Página 56
... elevation . Contours should be filled in from each station while car- rying on the regular work , when it is possible to ascertain heights for that purpose , and in selecting positions for for- ward signals , and in prosecuting the work ...
... elevation . Contours should be filled in from each station while car- rying on the regular work , when it is possible to ascertain heights for that purpose , and in selecting positions for for- ward signals , and in prosecuting the work ...
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25 cents 50 cents accuracy adjustment alidade axis brass BRIDGES centre chain circle clamp Cloth Coast Survey construction contours correct cross-hairs curves declinatoire depression determined diagram direction distance Edition Engineers engravings Feet fiducial edge field forward line forward signal GEOLOGY OF PENNSYLVANIA Graphical Statics ground HAND-BOOK height hills horizontal Hypsometry instrument intersection line of sight lines drawn lithographic plates marked means measured meridian metal method metres middle point minutes of arc Morocco necessary objects observed Paper covers parallel pencils perpendicular placed plane plane-table plotted points point occupied point sought falls PRACTICAL TREATISE Prof projection QUALITATIVE CHEMICAL ANALYSIS resection right angles rule scale sheet shore line side sketching Slide Valve slope station Steam Steel straight edge surveyor taken tangent screw telemeter telescope tion topographer triangle of error triangulation points true point U. S. Navy vertical arc wood-cuts Yale College ZERAH COLburn
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