Re: ATM: Mirror Polish Testing

["James W. Burrows" <burrjaw@halcyon.com>]

At 08:13 97-09-22 -0700,  Michael J. Coslo wrote:
>>         I have been checking the mirror for degree of polish with a
>> laser
>> pointer, shining it into the mirror and observing how visible the beam
>> is
>> on the surface.
>>
>>         The beam is barely visible on most of the mirror, except for
>> the
>> last half-inch near the edge, the entire way round the mirror. There
>> the
>> beam starts to reflect a good deal more light. The polish of the edge
>> looks
>> fine under strong normal light.
>>
>>         Should I be able to proceed to testing the mirror now, or
>> continue
>> polishing?

I'd say give it a quick test to see if you're looking at a fierce TDE
<shudder>; you'd probably want to slant your polishing (preliminary
figuring) to address that.  Or maybe think about the cop-out mask.

        -- Jim Burrows          phone 206-244-2933, fax -0294
        -- Email                burrjaw@halcyon.com
        -- Seattle              N47.4722, W122.3661 (WGS84)