I apologize for the somewhat blurry images. I will attempt to somehow replace them with better images in the next update. djk-180610
OK--I can surely do better with the images, but I don't think the results will ever be satisfactory. I think that what worked in a 1970s magazine isn't going to be easily readable on today's internet. I'll try to eventually redo the graphics using hopefully more internet friendly tools. djk-180622
