The Plane-table and Its Use in Topographical SurveyingD. Van Nostrand, 1869 - 79 páginas |
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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 bc ' on ba = bc , extend be 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 at ✓ in the same ...
... resection upon them when the table is not in position . Lay off bc ' on ba = bc , extend be 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 at ✓ in the same ...
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 ...
Otras ediciones - Ver todas
The Plane-table and Its Use in Topographical Surveying Alexander Medina Harrison Vista completa - 1884 |
A Treatise on the Plane-Table and its use in Topographical Surveying: (From ... Vista completa - 1870 |
Términos y frases comunes
accuracy adjustment alidade axis brass Brevet Bridge centre chain Chemistry circle clamp Cloth Coast Survey construction contours correct cross-hairs declinatoire depression detail determined diagrams direction distance draw edition elevation engravings experiments Feet fiducial edge field formula forward line ground heights hills horizontal Hypsometry Illustrated instrument intersection Iron J. P. WHITNEY line of sight lines drawn lithographic plates manufacture marked measured ment meridian Merrimack River method metres metric system middle point Mines objects observed paper parallel pencils perpendicular placed plane Plane Table plane-table plotted points point occupied position PRACTICAL TREATISE Prof projection Railway resection revised and enlarged rule scale sheet side sketching slope station Steam Engine steel straight edge Students Submarine surveyor taken tangent screw Telegraph telemeter telescope tion TOPOGRAPHICAL SURVEYING triangle of error triangulation points true point Trusses U. S. Army U. S. Navy vertical arc wood-cuts ZERAH COLBURN