Jerry,

This drawing would be clear to anyone who ever had to read a mechanical drawing or to anyone who had a mechanical drawing class in school.

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There are several clues in the way the drawings are shown which follow standard mechanical drawing conventions. Your local library will have introductory books on mechanical drawing that can show you more of the conventions. Knowing how to read a mechanical drawing is something that is almost essential for anyone working in electronics.

·???????? Solid lines in a mechanical drawing are used to show the shape and dimension of things that are directly visible.

·???????? Dotted lines are used to indicate the shape, dimension, and (on occasion, the depth) of something that is not visible.

·???????? There will always be three mechanical drawings, each from a different orthogonal axis, unless because of symmetry or because the shape is simple, only two are necessary, as in this case.

·???????? When there are three drawings they will be aligned with each other, and at right angles. These three orthogonal (right angle) drawings provide an unambiguous description of the object’s shape and dimension.

·???????? When combined with the dotted lines, portions of the object that are not visible can be unambiguously determined. ?

·???????? Finally, it is a convention to show the bottom view of the pin outs unless it is stated otherwise.

Dennis

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