Results of observations of the Nova Cygni 1975

The Nova Cygni 1975 was investigated in August-September by the 60-cm telescope with diffraction spectrograph. The time evolution of hydrogen emission line contours has been traced. It is shown that at the beginning of the phase of the decline of brightness physical conditions were different in different parts of the envelope. Radial velocities have been measured. The time evolution of the velocities was found to be different for different parts of the envelope. It is suggested that at the moments of the ejection of the main envelope the ejection velocities differed for different directions