  Possibilities of the nuclear emulsion technique for the study of the systems
of several relativistic fragments produced in the peripheral interactions of
relativistic nuclei are discussed. The interactions of the $^{10}$B and
$^{9}$Be nuclei in emulsion are taken as an example to show the manifestation
of the cluster degrees of freedom in relativistic fragmentation. For the case
of the relativistic $^{9}$Be nucleus dissociation it is shown that exact
angular measurements play a crucial role in the restoration of the excitation
spectrum of the alpha particle fragments. The energy calibration of the angular
measurements by the $^{9}$Be nucleus enables one to conclude reliably about the
features of internal velocity distributions in more complicated systems of
relativistic $\alpha$ particles.
