ATM [Fwd: BOUNCE atm@shore.net: Non-member submission from [ARBPJBJLB@aol.com]]

[Mel Bartels <mbartels@efn.org>]

> Subject: mirror testing
>
> I am very interested in grinding a mirror  & have read Telescope making but
> don't quite understand the math in testing. I think I understand how to read
> the test to get a spherical shape but don't quite understand how to determine
> the couder mask window sizes. correct me if I'm wrong. Once the couder mask is
> made one checks the individual zones & note the micrometer thimble reading
> where each zone grays evenly. If this is correct than how does one determine
> what the correct measurements are. Please any guidance here would be
> appreciated. I'm a designer & tool maker by trade so making other components
> aren't a problem. If I can understand this part I think I will be ready to
> order the kit.
>
>                             Thanks!!
>                                         Rusty Burnett
>                                         arbpjbjlb@aol.com



--
Clear skies, Mel Bartels
http://www.efn.org/~mbartels