Charlie,

The TriangleCD was done with an electro-pencil. However, I believe that a template was used instead of just free hand. (i.e. the triangle is a perfect equilateral and the curves of the CD are perfect halves of a circle. There is a slight over scribe of one side of the triangle as though the template slipped slightly and was repositioned).

It would be interesting to know whether the two different types of Civil Defense markings (the words and the logo) represent different places or a different time frame. My guess is that the free hand printing either preceded the logo template or the logo was done in a locale that was much more organized.

Bob