A technically simple modification of centrifugal moulding method for the solidifying and liquid very large telescope mirrors is described. The principal idea of this technique is the use of rotating containers floating freely in the intermedium dumping liquids (IDL). The results of testing experiments are discussed. The new type of telescope mount which is based on the IDL technique is presented.
Victor P. Vasilyev,
"IDL technique for very large telescope mirrors development", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176172; https://doi.org/10.1117/12.176172