Information on period pilot maps

[RedToo]

Originally Posted by BadAim

Now that's more like it! What is that backing though, now I'm all curious.

Hi Badaim,

The backing is a mesh of fine threads at right angles to each other. Each thread is like a thread of fine white cotton. The width of the gap between each thread varies between 1 and 1 1/2 millimetres (approximately).

RedToo.