Abstract: An accumulator-exchanger of the filling-body type, the rigid spherical shells of which are partially filled with a heat and/or cold storage agent having a high liquid-solid transformation latent heat, such as water, salt hydrates or paraffins, and with a compressible material for absorbing the variations in the volume of the storage agent during its phase change. Projections for increasing the exchange surface area consist of raised features inscribed on the shells of the filling bodies, which raised features all have an axis of symmetry passing through the center of symmetry of their base and through the center of the filling body. The bases of the raised features are all equal and identical and the raised features are uniformly distributed over the entire surface of the shell.

Abstract: A hood for mounting a unidirectional lamp adjacent a window, such as a windshield, of an emergency vehicle and within a passenger compartment of the vehicle for directing light through the window. The lamp includes a housing having a forward portion defining an opening therein, a light source within the housing, and a lamp lens adjacent the forward portion of the housing and covering at least a portion of the opening for directing light from the light source through the opening. The hood comprising a hood body mountable adjacent the window having a rearward end defining a first open port dimensioned for receiving the forward portion of the housing, a forward end defining a second port opposite the first port, and a light pathway between the first and second ports for transmission of a beam of light from the light source through the body. A hood lens is within the body for optically altering the beam of light transmitted along the light pathway.