A series of infinite-medium spectral measurements has been performed on ZrH1.75 at room temperature, 150 C, 170 C, 316 C, and 468 C, using the General Atomic linear accelerator as a pulsed-neutron source. Two poison concentrations were used, 3.4 and 8 barns per hydrogen atom. These measurements clearly demonstrated that neutron spectra in zirconium hydride shift rather markedly with temperature. The above spectra were calculated theoretically assuming the hydrogen atoms to be bound in an isotropic harmonic potential, and allowing for the possibility of accoustical vibrations in the zirconium hydride lattice. The agreement between theory and experiment is very good.