The great refractor of Meudon Observatory

The largest telescope in Europe.- The project. Realization. The dome.- Optics. The frame. The bezel.- Use. Renovations.- Observations, discoveries.- The first observations. Photography (from 1898 to 1904).- The beginnings of spectroscopy (1898 to 1904).- Revelations of the planets (from 1909 to 1935).- The polarization of light (from 1924 to 1929).- The explosions of stars. High magnification (1935 to 1956).- Double stars. Returning to the planets (from 1956 to 1973).- Half service to science (1973 to 1990).