THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 4
... fixed . Upon its lower edge or peri- phery this cone is fashioned into a horizontally projecting rim , the inferior face of which is as nearly as possible a perfect plane , and this in its turn rests upon a correspond- ing rim of a ...
... fixed . Upon its lower edge or peri- phery this cone is fashioned into a horizontally projecting rim , the inferior face of which is as nearly as possible a perfect plane , and this in its turn rests upon a correspond- ing rim of a ...
Página 14
... fixed in its relative proportions ; and the difficulty is greatly increased from the want of uniformity in this variation in the different parts of the sheet and in different directions . In case of trouble with the points arising from ...
... fixed in its relative proportions ; and the difficulty is greatly increased from the want of uniformity in this variation in the different parts of the sheet and in different directions . In case of trouble with the points arising from ...
Página 27
... fixed position . The cause of the trouble must , of course , be removed on the first opportunity . The next operation is to " take the forward line " to the next point which it is desirable to occupy or determine , either some natural ...
... fixed position . The cause of the trouble must , of course , be removed on the first opportunity . The next operation is to " take the forward line " to the next point which it is desirable to occupy or determine , either some natural ...
Página 31
... fix the point , surrounded by a small circle in pencil . The point may be still further tested by resection from C. If the ... fixed upon the map , pricked through and marked ; and these being well determined , can now be used for the ...
... fix the point , surrounded by a small circle in pencil . The point may be still further tested by resection from C. If the ... fixed upon the map , pricked through and marked ; and these being well determined , can now be used for the ...
Página 35
... fixed points is called the great triangle , and the circle passing through the same points , the great circle . CLASS 1. - When the point sought falls within the great triangle , the true point is within the triangle of error . ( Case 1 ...
... fixed points is called the great triangle , and the circle passing through the same points , the great circle . CLASS 1. - When the point sought falls within the great triangle , the true point is within the triangle of error . ( Case 1 ...
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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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