[ATM] Optical flat part II

[James Sturtevant]

>Martti Koskimo once proposed a liquid surface in place of flat mirror
>for test in autocollimation. Mirror to be tested is supported above the
>pool of oil which serves as autocollimating  flat.
>I wander if somebody tried this. Should not be more complicated
>than interference test with mirror under the  surface of liquid.
>
>Regards
>Vladimir.

Some years ago, I tried oil flat autocollimation with an 8 in. mirror. This 
was before the advent of very bright LEDs and I was trying to use an 
incandescent light source. The heat from the light caused so much turbulent 
inference that the setup was useless. Someday I may try again with a good 
LED.

Jim Sturtevant

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