On the observability of the crystal lattice with the images of their projections

In the paper, the solution of a problem of the observability of a three-dimensional crystalline lattice on its projections is considered on the basis of the theory of description of kinematics of a rotary motion and the observation and guidance theory of dynamic objects. The necessary and sufficient conditions are obtained for the observability of a crystalline lattice performing a rotary motion in space about the central knot. The fulfillment of the conditions for some special cases - a cubic cell and a tetrahedron - is considered. Expressions for the calculation of parameters of the observable lattices are derived.