18 Jun
2014
18 Jun
'14
2:23 p.m.
Date: Mon, 16 Jun 2014 11:54:40 -0400 [in issue 29] From: James Propp <jamespropp@gmail.com>
Has anyone designed a mechanism that permits the spirographer to focus on circumferential force? The knockoff product I have, has holes in both parts, suitable for pushing pins through, so in theory you only have to push on the pen tip. Rather than a wax tray the first thing I'd think of would be corrugated cardboard & the second, cork. I'm imagining something like a latchable/unlatchable zipper. That's a fascinating idea in itself. It could be used in funicular railways, for instance.
Although the zipper tooth design is asymmetrical, I have a coat that unzips from both ends. --Steve