Thanks all for the input. The "from the inside out" idea occurred to me after I had already posted the question. I saw the paper-cut method elsewhere, but it seemed cumbersome, and I wondered if there were some (obvious) trick that I just hadn't thought of myself or stumbled across with the Google machine. I also considered writing it out, sized as I wanted it to be, and then, using a light pad, sort of "roll" the line of text along the spiral to get a rough idea of whether it would fit, or need a larger spiral on larger paper. Sort of like measuring the circumference of a circle by using a regular straight ruler. Sure, it's a kludge, but I'm looking for approximations here, not exact length. For me, the most workable method seems to be the one posted by GregB: center outwards to get the length, then once again from the outside in. Who knows, I might even like the way the center-out looks! I'll post a scan of my first rough-draft (used a compass to make the spiral, picked an appropriately-sized nib, and just started writing. As luck would have it, it came out better than I could have planned it in advance... but it's pretty shabby, as it was just an exercise in spiral writing. I'd like to re-do it as more of a finished product. The question about spacing isn't for this one directly, just a general question about working with spirals in general, since I'm enjoying them so much! Thanks again for the replies!
