How to realize a convex secondary mirror
To "start off on the right foot" – given that the reader might not know the reason why in some types of telescope must create a secondary mirror of convex type, we make a "panoramic" on the evolution of telescopes that led to the use of this type of mirror. The refractor telescopes were the first to appear
I sferometro
The spherometer is a measuring instrument used in the machining of an astronomical mirror, to verify the depth of the sagitta, and then the radius of curvature of the surface under examination. The instrument itself is not complicated, It's consists of a rigid supporting structure on which are placed 3 supporting feet arranged
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