THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 6
... sights or a watch telescope has some- times been attached to the under side of the board of the plane - table . When the table has been put " in position , " the watch telescope is directed to some well - defined object , and by after ...
... sights or a watch telescope has some- times been attached to the under side of the board of the plane - table . When the table has been put " in position , " the watch telescope is directed to some well - defined object , and by after ...
Página 12
... sight exactly to some distant object ; the fiducial edge is then placed against them and the telescope directed to the object . If the cross - hairs bisect it , the adjustment is cor- rect ; but if they do not , it can be corrected by ...
... sight exactly to some distant object ; the fiducial edge is then placed against them and the telescope directed to the object . If the cross - hairs bisect it , the adjustment is cor- rect ; but if they do not , it can be corrected by ...
Página 26
... sight , the edge of the rule being upon the two plotted points ; the one , s , perpendicularly over the occupied station , and the other , b , the station observed . upon . As a test of the correctness of this , place the rule upon the ...
... sight , the edge of the rule being upon the two plotted points ; the one , s , perpendicularly over the occupied station , and the other , b , the station observed . upon . As a test of the correctness of this , place the rule upon the ...
Página 39
... sight from the true point to the middle point b . Set on this line , resect upon a and c , and d is the point sought . If the two triangles of error are situated on the same side of the true line of sight to the middle point , the par ...
... sight from the true point to the middle point b . Set on this line , resect upon a and c , and d is the point sought . If the two triangles of error are situated on the same side of the true line of sight to the middle point , the par ...
Página 40
... sight through the middle point b and the point sought , ( d ) . By resection upon a and c , the position of the point on this line is fixed . The solution of this is as follows ( Figure 14 , Plate 31 ) : Lay off at a the angle bae = bdc ...
... sight through the middle point b and the point sought , ( d ) . By resection upon a and c , the position of the point on this line is fixed . The solution of this is as follows ( Figure 14 , Plate 31 ) : Lay off at a the angle bae = bdc ...
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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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