Build a Cassegrain secondary mirror (J. Texereau)

ITALIAN TRANSLATION OF CHAPTER 8 DEL LIBRO “LA CONSTRUCTION DU TELESCOPE D’AMATEUR” di Jean Texereau La difficoltà principale della costruzione di un telescopio in una combinazione Cassegrain o sua variante, is due to the secondary mirror that is convex, and therefore cannot be controlled with Foucault's Method without the use of expensive tools as auxiliary optical components, poiché […]

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The spherometer

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 piedini di appoggio disposti […]

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