On 3 Jun 2005 17:53:41 -0400, (DoN. Nichols) wrote:

The "jet mirror" -- is that mounted in a ring into which turbine
blades dovetail? Ir is it a ring gear of some sort?

That's one of the little ones. I've made several.

That particular one is just a knife-edge seal - the diagonal bars round
the edge hold it in place and there are a couple of sharp rings on the
inside edge to form the seal. Some of the others are "stator" rings -
static vanes at the end of the compresor stage.

http://codesmiths.com/shed/mirrors/
(new selling site is under development - visit the market stall if
you're in Bristol)