Re: ATM "Frozen" liquid mirrors

[Rien.Lugt@space-elec.dofn.de (Marinus van der Lugt RST16)]

Hi,

Yust a thought,

>    Spincasting is based on the idea that the surface of a
>liquid, in uniform  rotation about a vertical axis and under
>gravity, assumes a parabolic shape.  The shape of the parabola,
>and hence the focal length, is a function of the rotational
>speed.  The size, of course, is that of the container.  Therefore
>if the liquid can be gradually and uniformly turned into a solid
>while rotating, then one can generate parabolas of arbitrary
>sizes and focal lengths.  As someone has pointed out (sorry, I
>lost you post), this is a very nifty way to generate off-axis
>parabolas.

Hmmm, sounds like a good idea to produce two mirrors at the same
time for building a schiefspiegler bino !

Anybody care to try ?

Rien.