Building a secondary mirror Cassegrain (J.Texereau)
ITALIAN TRANSLATION OF CHAPTER 8 THE BOOK "THE CONSTRUCTION OF THE AMATEUR TELESCOPE" Jean Texereau (NOTE: For French speaking readers, it is advised to read this article directly on the book he also took again, (pages 137 – 149) to avoid mistakes due to the double automatic translation). The main difficulty of the construction of a telescope in a combination