THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 24
... resection , " and measured distances . In the first of these the point must be seen from two or more occupied points in suitable positions , with regard to the point to be determined ; in the second , it must be occupied ; and in the ...
... resection , " and measured distances . In the first of these the point must be seen from two or more occupied points in suitable positions , with regard to the point to be determined ; in the second , it must be occupied ; and in the ...
Página 31
... resection from C. If the forward line from s has also been chained , the distance taken from the scale and laid off from s on the line ƒ will afford still another test , and it is quite sufficient if it agree with an intersection where ...
... resection from C. If the forward line from s has also been chained , the distance taken from the scale and laid off from s on the line ƒ will afford still another test , and it is quite sufficient if it agree with an intersection where ...
Página 38
... resection upon three fixed points . 1st . Lehmann's method . ( Figure 7 , Plate No. 4 . ) — This method is based upon the fact that the point sought is al- ways distant from the three lines drawn from the three fixed points in ...
... resection upon three fixed points . 1st . Lehmann's method . ( Figure 7 , Plate No. 4 . ) — This method is based upon the fact that the point sought is al- ways distant from the three lines drawn from the three fixed points in ...
Página 40
... resection upon them when the table is not in position . Lay off be ' on ba = bc , extend bc and lay off baba . Call the angle at the intersection ab = x , and that at the inter- section bc = y . At a lay off toward you △ ba ' e = Ly ...
... resection upon them when the table is not in position . Lay off be ' on ba = bc , extend bc and lay off baba . Call the angle at the intersection ab = x , and that at the inter- section bc = y . At a lay off toward you △ ba ' e = Ly ...
Página 41
... Resection upon a and c then fixes the posi- tion of d . The angles e and d of the quadrilateral aecd make up from the construction two right angles ; hence a circle may be described about the quadrilateral , and we have the periphery ...
... Resection upon a and c then fixes the posi- tion of d . The angles e and d of the quadrilateral aecd make up from the construction two right angles ; hence a circle may be described about the quadrilateral , and we have the periphery ...
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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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