Mysterious Maps

Secret map

This is a photograph of a map found in the collection of the National Air and Space Museum.

It is not printed on paper.

What is it’s purpose?

Why is it not printed on paper?

Please post a comment below explaining your story of the map. Next  week I will reveal the answer.

Regards Dr Mackey at Smithsonian

If you need a good magnifying glass you can find it at Costco one of them.