Measurements of the time and energy dependence of the spectrum of slow neutrons emerging from small pulsed moderators are reported. The results are presented with absolute normalization. Our techniques made measurements possible using a 150 keV Cockroft-Walton D-T neutron generator, producing 1011 n/sec (peak). Energy spectra and time distributions at various energies are reported for slabs of polyethylene at 296°K, and polyethylene, solid ammonia, and solid methane at 77 °K. Variations of yield with overall moderator thickness are described. The effects on spectra and time distributions are elucidated by a series of measurements with cadmium heterogeneous poison at various depths beneath the moderator surface. We compare cadmium and gadolinium heterogeneous poisons, which differ in the energy below which the poison is effective. Results are useful for pulsed moderator design, and as tests of neutron scattering kernels and methods of calculation.