The stability of such motion is investigated when the body rotates at constant angular velocity around the vertical, while its centre of mass moves between collisions on a parabola or along a fixed vertical line coinciding with the axis of rotation of the body. Stability conditions are obtained ...
According to one aspect, therefore, the present invention resides in the provision, in a lamp of the type comprising a reflector having a generally concave reflecting surface whose general shape is defined by the revolution of a parabola about an axis coinciding with the axis of symmetry of the...