Practical Plane And Solid Geometry Including Graphic Arithmetic
Practical Plane And Solid Geometry Including Graphic Arithmetic
Henry Angel
The book Practical Plane And Solid Geometry Including Graphic Arithmetic was written by author Henry Angel Here you can read free online of Practical Plane And Solid Geometry Including Graphic Arithmetic book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Plane And Solid Geometry Including Graphic Arithmetic a good or bad book?
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P. Is in and below the h. P. Is in A point behind the v. The second dihedral angle. A point behind the v. P. The third dihedral angle. A point in front of the v. P, the fourth dihedral angle. If two lines be supposed to pass through the actual position of a point, one being perpendicular to the h. P. , and the other to the v. P. , the intersection of these lines with the respective planes will be the plan and elevation of the point. These imaginary lines are called pro- jectors, and the plan an...d elevation, the projections of the point. Thus a point in the first dihedral angle would have its plan upon the front part of the h. P. , and its elevation upon the upper part of the v. P. A point in the third angle would have its plan upon the back part of the h. P. , and its elevation upon the lower part of the v. P. 104 OKOMETRT. The student, to understand these facts, must use hii model, and demonstrate for himself the positions of the various plans and elevations. If a point be in * one of the co-ordinate planes, either its plan or elevation must be in X Y ; and if it be in both planes, the plan and elevation will coincide with the actual point itself upon X Y.
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