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So why are there two variables? Simple. MEASUREINIT (short for measurement initial) sets the default value for new drawings, while MEASUREMENT sets the value for the current drawing.

Somewhat surprisingly, you don’t need to consider scale when setting up a new drawing. In fact, rule number 1 in AutoCAD is to always draw everything full size. Hmmm, that makes quite a few rule number 1s, doesn’t it?

“Wait a minute! I want to draw a map of the known universe! If I draw full size, where am I going to find a sheet of paper big enough to print it — and who will help me fold it?”

Trust me. All will become clear shortly.

If you’ve ever done paper-and-pencil drafting (and there are fewer and fewer of us left who have), you’ll find that AutoCAD’s electronic paper works backward from dead-tree paper.

 Dead-tree paper: In the (distant) past, we considered the approximate size of the object that we were drawing by hand and the views we wanted, selected a suitable sheet of paper from a set of standard sizes, and then scaled the drawing of the object to suit the sheet of paper. We were constantly translating sizes between the real-world object and our drawing of it. The height of text and the size of the components in dimensions were fixed. Again, scales were selected from a list of preferred values, such as 1:2. You rarely saw a paper drawing at a scale of, say, 1:2.732486921.