A Manual of Map-Making and Mechanical Geography; Illustrated by 60 Engravings Comprising Projections of the Sphere, General and Particular Maps, and Topographical Plans, for the Purpose of Facilitating Practical Education, and the Operations of Land-Surve
A Manual of Map-Making and Mechanical Geography; Illustrated by 60 Engravings Comprising Projections of the Sphere, General and Particular Maps, and Topographical Plans, for the Purpose of Facilitating Practical Education, and the Operations of Land-Surve
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ...For in all horizontal projections, the place one is in is considered as the centre of the map, the rational horizon being its extremity. The eye is supposed to be placed in the nadir, or point diametrically opposite to the zenith of the place in the centre; and the plane of projection will be coincident with the plane ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ...For in all horizontal projections, the place one is in is considered as the centre of the map, the rational horizon being its extremity. The eye is supposed to be placed in the nadir, or point diametrically opposite to the zenith of the place in the centre; and the plane of projection will be coincident with the plane of the horizon. Thus, suppose we were required to make a projection of this kind on the horizon of London, that city would be in the zenith, and our eye would be in the nadir; hence all rays of light falling from the globular surface upon the eye in the nadir, would pass through the horizon; and those portions of the earth's surface about the place on which the projection is made will be contracted, whilst those towards the plain of projection will be enlarged, In the diagram, Figure 28, the pole is projected within the primitive circle, or plane of projection; and its distance OP, from the centre 0, is equal to the tangent of half the complement of latitude. The method of drawing the meridians and parallels of latitude will be found in the two following problems: --66. Peoblem I. First, to draw the circles of latitude 1. Having assumed Z (Fig. 30, No. 1) for the centre of the map and the situation of London, for example, we describe the circle WNES, and draw WE, NS at right angles to each other. NS will be the first meridian, and WE the prime vertical or azimuth east and west. 2. Divide the quadrant EN into 9 equal parts, and at 51 i from N set off the point A, the elevation of the north pole for the latitude of London. From W to this point draw the line WPA; and the intersection of this line with NS as in P, will be the place of the arctic pole. 3. Take the chord of any of the quadrants, as NE for instance, and from A set off the space AB equ...
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