Compton profiles (CPS) of the allotropic forms of Ti, HCP and BCC, have been measured and their difference has been compared with the existing literature. To avoid ambiguities in obtaining the CP differences introduced by the many corrections needed to derive these differences through the absolute CP deduced from the raw data, the spectra of scattered gamma -ray radiation by the two Ti allotropic forms were measured in situ. To achieve this, the gamma -ray spectrometer was modified in such a way that the Ti sample could be heated to 1280 K in order to transform it to its BCC structure while the scattering geometry remained exactly the same as in the case of the HCP structure (Ti at room temperature). The comparison between existing theories and this experiment demonstrated that the long-range periodicity influences the electron momentum distribution somewhat less than the band-structure theory suggests.