A technique is presented for conducting neutron-wave experiments in thermal-neutron systems using either a sinusoidally modulated or a pulsed source of thermal neutrons. A neutron source suitable for this experiment is described, data-accumulation criteria are presented, and the electrical systems used for collection are discussed. A specific experiment with graphite is reported and the discussion of data analysis is carried through the experimental determination of this system's dispersion law. It is found that, in general, a pulsed source of thermal neutrons is more suitable for neutron-wave experimentation than a sinusoidally modulated source. Confirmation is given to the theoretical prediction that diffusion and thermalization parameters can be measured by this technique over a relatively wide range of frequency without significant higher space- and energy-mode contamination. The values we obtained for the diffusion and thermalization parameters for graphite of density 1.60 g/cm3 were α0 ± 91. ± 1 sec−1, D0 = (2.16 ± 0.01) × 105 (cm2 sec−1), C0 = (39. ± 2) × 105 (cm4 sec−1), and F0 = (12. ± 2) × 107 (cm6 sec−1).