Re: ATM 8" refractor project

[David Margrave <davidma@eskimo.com>]

Dan, this sounds itnteresting. I'm having trouble visualizing this.  Do
you have any pictures on-line?


> I don't understand why. I made a very successful 7" achromat with
> one and only one spherometer and NO dial indicator. It consists of
> a micrometer attached to the end of a lever arm that yields a movement
> 33% of what the micrometer indicates. The accuracy is easily under
> .001" and the two 'feet' balls contact very nearly to the edges of the
> lenses