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" ... the projections of cd, PI. I., Fig. 2. 9. Remark. A general principle, which it is important to be perfectly familiar with, is embodied in several of the preceding examples; viz. When any line is parallel to either plane of projection, its projection... "
Elements of Descriptive Geometry: With Their Application to Spherical ... - Page 14
by Charles Davies - 1835 - 174 pages
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A popular and practical treatise on masonry and stone-cutting

Peter Nicholson - Masonry - 1828 - 276 pages
...horizontal projection above, the ground-line. The reciprocals of these propositions are also true. If a line be parallel to one of the planes of projection, its projection upon the other plane will be parallel to the ground-line. Thus, for example, if a line be parallel...
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Civil Architecture, Or, A Complete Theoretical and Practical System of ...

Edward Shaw - Architecture - 1832 - 402 pages
...horizontal projection above, the ground-line. The reciprocals of these propositions are also true. If a line be parallel to one of the planes of projection, its projection upon the other plane will be parallel to the ground-line. Thus, for example, if a line be parallel...
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Operative Masonry: Or, A Theoretical and Practical Treatise of Building ...

Edward Shaw - Architecture - 1832 - 244 pages
...horizontal projection above, the ground-line. The reciprocals of these propositions are also true. If a line be parallel to one of the planes of projection, its projection upon the other plane will be parallel to the ground-line. Thus, for example, if a line be parallel...
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Practical Masonry, Or, A Theoretical and Operative Treatise of Building ...

Edward Shaw - Masonry - 1846 - 342 pages
...horizontal projection above, the ground-line. The reciprocals of these propositions are also true. If a line be parallel to one of the planes of projection, its projection upon the other plane will be parallel to the ground-line. Thus, for example, if aline be parallel to...
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Industrial Drawing: Comprising the Description and Uses of Drawing ...

Dennis Hart Mahan - Drawing instruments - 1855 - 240 pages
...one plane of projection, its projection on that plane is equal to the length of the line, and that its projection on the other plane is parallel to the ground line. In this case we see that the top of the prism, which is a hexagon parallel to the horizontal plane,...
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A Manual of Elementary Geometrical Drawing, Involving Three Dimensions ...

Samuel Edward Warren - Geometrical drawing - 1861 - 154 pages
...parallel to either plane of projection, its projection on that plane is equal and parallel to itself, and its projection on the other plane is parallel to the ground line. 10. The preceding remark serves to show how to find the true length of a line, when its projections...
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A Manual of Elementary Geometrical Drawing, Involving Three Dimensions ...

Samuel Edward Warren - Geometrical drawing - 1867 - 178 pages
...parallel to either plane of projection, its projection on that plane is equal and parallel to itself, and its projection on the other plane is parallel to the ground line. 10. The preceding remark serves to show how to find the true length of a line, when its projections...
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Elements of Descriptive Geometry: With Their Application to Spherical ...

Charles Davies - Geometry, Descriptive - 1868 - 258 pages
...Fig. 2.) be the ground line, AB the horizontal, and A'B' the vertical projection of a right line. If n plane be drawn through AB perpendicular to the horizontal...plane of projection to which the line is parallel. 9 28. IJ a line be perpendicular to one of the planes of projection, its projection on that plane is...
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A Manual of Elementary Projection Drawing, Involving Three Dimensions

Samuel Edward Warren - Geometrical drawing - 1878 - 212 pages
...parallel to either plane of projection, its projection on that plane is equal and parallel to itself, and its projection on the other plane is parallel to the ground line. 10. The preceding remark serves to show how to find the true length of a line, when its projections...
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A Manual of Elementary Projection Drawing, Involving Three Dimensions ...

Samuel Edward Warren - 1875 - 184 pages
...parallel to either plane of projection, its projection on that plane is equal and parallel to itself, and its projection on the other plane is parallel to the ground line. 10. The preceding remark serves to show how to find the true length of a line, when its projections...
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