Published on February 23, 2017
A true liquid mirror telescope is made with a reflective liquid like mercury or low temperature melting metals like gallium. Rotation speed determines the depth and focal length. Liquid metal mirrors only focus straight up in the zenith position directly above the rotating material. The resin setting can be preformed but requires a precise rotational speed control during curing. All fluid like materials form a paraboloid when the solid body rotation is achieved.
