From: Dale Eason 
To: Pat Bunn , John Murray
, Amateur
        Telescope Makers ,
  Mirror Matic 
Reply-To: Dale Eason 


Believe it or not the tester already has all the accuracy required and
cannot easily be improved upon. I am always amazed that such a simple
device can be used to make  extremely accurate measurments.

You may already be aware of the updates to the tester but if not here is a link.

http://www.stellafane.com/atm/atm_foucault_tester/atm_tester_plans_4.htm

-+- Pat Bunn  wrote:
>
> I am just beginning to assemble a "Stellaphane" type
> tester with some
> machined aluminum and brass parts ( I have spent the
> last week machining
> these - I am not a machinist), rather than the wood
> mechanics.
>
> I am using 3/4" birch plywood with a nice
> polyurethane finish and a metal
> vernier mechanism and slide arrangement. My stage
> "faceplate"  is 1/4"
> delrin sheet rather than 1/4 " plywood.
>
> Any ideas or improvements on the light source and
> slit arrangement or is the
> published design good enough. I am trying for a more
> accurate design than
> the basic wood design.
>
> Pat Bunn
>
>


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