2.
Draw dotted lines in the following figures to show their hidden edges:
Answers
Answer:
It is standard practice to use dashes to represent any line of an object that is hidden from view. A drafter—in deciding whether a line in a view should be represented as hidden or as visible—relies on the fact that in third-angle projection the near side of the
Answer:
Hidden lines
Hidden linesIt is standard practice to use dashes to represent any line of an object that is hidden from view. A drafter—in deciding whether a line in a view should be represented as hidden or as visible—relies on the fact that in third-angle projection the near side of the object is near the adjacent view, but in first-angle projection the near side of the object is remote from the adjacent view. In Figure 4B (third-angle projection) the top of the front view is near the top view; the front of the top view is near the front view; and the front of the side view is near the front view. In first-angle projection, however, the top of the front view is remote from the top view; the front of the top view is remote from the front view, and the front of the side view is remote from the front view. In a third-angle projection, what is remote in an adjacent view cannot hide what is near in that view.
Hidden linesIt is standard practice to use dashes to represent any line of an object that is hidden from view. A drafter—in deciding whether a line in a view should be represented as hidden or as visible—relies on the fact that in third-angle projection the near side of the object is near the adjacent view, but in first-angle projection the near side of the object is remote from the adjacent view. In Figure 4B (third-angle projection) the top of the front view is near the top view; the front of the top view is near the front view; and the front of the side view is near the front view. In first-angle projection, however, the top of the front view is remote from the top view; the front of the top view is remote from the front view, and the front of the side view is remote from the front view. In a third-angle projection, what is remote in an adjacent view cannot hide what is near in that view.
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