Topographical Drawing And Sketching, Including Applications of Photography
Topographical Drawing And Sketching, Including Applications of Photography
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Plotting consists in locating on paper and in their true relative positions, the points, lines and angles determined in the field. Topographical maps are usually confined to the representations of areas of the earth's surface so small that in their construction the earth's sphericity may be neglected ; therefore the methods of plotting used in plane-surveying are appropriate. The methods employed for representations of larger areas are described in Part V.
The usual sequence observed is to firs...t define the limits of the map and the proper direc- tion of a meridian line, then to plot the triangulation, traversing and levelling, in the order given.
55. Plotting of Points, Lines and Angles, — A point is plotted by assuming its position, by determining its direction and distance from a given point, or by the intersection of given li;ies. Its position is indicated as described in 6, par. 43.
A right line of known length and unknown position is plotted by assuming a point for one extremity, and, with a straight-edge as a guide for the pencil-point, drawing a fine line accurately through the point ; the other extremity is then determined by the application of the scale of distances ; or the exact length may be laid off from the assumed point with the scale, and the line drawn afterwards.
What to read after Topographical Drawing And Sketching, Including Applications of Photography?
You can find similar books in the "Read Also" column, or choose other free books by Henry a Henry Albert Reed to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Plotting consists in locating on paper and in their true relative positions, the points, lines and angles determined in the field. Topographical maps are usually confined to the representations of areas of the earth's surface so small that in their construction the earth's sphericity may be neglected ; therefore the methods of plotting used in plane-surveying are appropriate. The methods employed for representations of larger areas are described in Part V.
The usual sequence observed is to firs...t define the limits of the map and the proper direc- tion of a meridian line, then to plot the triangulation, traversing and levelling, in the order given.
55. Plotting of Points, Lines and Angles, — A point is plotted by assuming its position, by determining its direction and distance from a given point, or by the intersection of given li;ies. Its position is indicated as described in 6, par. 43.
A right line of known length and unknown position is plotted by assuming a point for one extremity, and, with a straight-edge as a guide for the pencil-point, drawing a fine line accurately through the point ; the other extremity is then determined by the application of the scale of distances ; or the exact length may be laid off from the assumed point with the scale, and the line drawn afterwards.
What to read after Topographical Drawing And Sketching, Including Applications of Photography?
You can find similar books in the "Read Also" column, or choose other free books by Henry a Henry Albert Reed to read onlineMoreLess
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