The essentials of descriptive geometry . A / \\11 \ r1 \\ \ \ \ \ \ \ \ \ Vv Fig. 7. ORTHOGRAPHIC PROJECTION 9 of indicating the location of an object with respect to the planesof projection. When an object is said to be in the first quadrantit means simply that it is above the H plane and in front of theV plane; therefore its plan view will be below the an object is said to be in the third quadrant it means that. First Quadrant. Second Quadrant. Third Quadrant. Fourth below G. L. and H and V coinciding Plan above G. L. and H and V coincidingelevation a6o!)e G. L.
The essentials of descriptive geometry . A / \\11 \ r1 \\ \ \ \ \ \ \ \ \ Vv Fig. 7. ORTHOGRAPHIC PROJECTION 9 of indicating the location of an object with respect to the planesof projection. When an object is said to be in the first quadrantit means simply that it is above the H plane and in front of theV plane; therefore its plan view will be below the an object is said to be in the third quadrant it means that. First Quadrant. Second Quadrant. Third Quadrant. Fourth below G. L. and H and V coinciding Plan above G. L. and H and V coincidingelevation a6o!)e G. L. above There-elevation below G. L. below G. L. There-fore plan and eleva- fore both views low G. 7A. it is below H and behind V; therefore its plan view will beabove its elevation. Also when a drawing is examined these rela-tiong, serve to assist in visualizing the object, and once thelanguage of projection and drawing is learned these detailsare not thought of as such, and one reads the drawing much asone reads a sentence without analysing it into subject, object,verb, etc. I. PROBLEMS IN PROJECTION Draw the plan and elevation of a regular hexagonal prism whose baseIS 2 in diameter and whose altitude is 3. 2. Draw the plan and elevation of a regular pentagonal pyramid whosealtitude is 3 and the sides of whose base are 2. 3. Draw the plan and elevation of a regular truncated hexagonal py
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400462, bookyear1915
