GREENPOWERSCIENCE | GALLIUM Parabolic Liquid Mirror similar to a mercury mirror 200 grams @GREENPOWERSCIENCE | Uploaded June 2013 | Updated October 2024, 1 week ago.
Melted gallium spinning at a variable RPM, concentrating sunlight to form a parabolic mirror that can burn a hole in the leaf.
greenpowerscience.com
I am working on a larger scale version of this experiment and testing unlikely optical applications. Liquid mercury telescopes have been successfully used for direct overhead imaging (zenith position).

HIGH SPEED MERCURY PLAYLIST:
youtube.com/playlist?list=PL786EBDC8D2B4CD1D

MERCURY TELESCOPE
youtube.com/watch?v=Q5Cr9P-Q88Y