Making a Blank Meniscus 406 F3,7 on refractory plaster mold

I refer to the following Michael Davis Youtube video that I have seen with interest and attention, also thanks to the “lock-down” impediments, fortunately so far in good health, successive in these times of crown virus, also considering that the English language dialogues of the films, constitute in Italy an obstacle for all willing and maybe scratch glass

Simulator (not only) polishing parabolic mirrors (POLSIM Software)

Small tutorial on using "minimum" of POLSIM software for the processing of a parabolic mirror telescope, "Assisted" by the use of a simple rotating plate, even in the digging operation of the "arrow" of the initial spherical concavity. The program was written in 2007 da Martin Cibulski, and it can be downloaded as polsim.exe (download) , as other interesting Articles