1.Introduction. 2.Summary of atomic and molecular structure. 3.Light sources and detectors. 4.Dispersion and resolving power. Prism spectrographs. 5.Diffraction gratings. 6.Interferometers. 7.Microwave and radiofrequency spectroscopy. 8.Width and shape of spectral lines. 9.Emission and absorption of line radiation. 10.Experimental determination of transition probabilities and radiative lifetimes. 11.Elementary plasma spectroscopy.