[ATM] SEC: UNCLASSIFIED:-Primary Mirror Retainers

[bobmay at nethere.com (Bob May)]

Put any stress on the bolt in the center and you are flexing the mirror and
it will show a trefoil shape to the stars as a result.
Without the stress, stars at the horizon (with a thin mirror) will tend to
get a wierd shape as the center will tend to tilt a bit causing a trail in
the shape of the star although that shape won't be too strong.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net