Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Many of the attachments are secured to rectangular jaws at the upper portion of the device. Seals form between the drum and trough a generally closed and pressurizable chamber through which the web passes and which is supplied with the treatment liquid at superatmospheric pressure so as to force the liquid against only the front face of the web. The invention also includes a method of manufacturing a lighting apparatus for a Gunner’s Quadrant, including applying a flexible circuit board including lights to a housing. A high frequency signal for AM broadcast is fed to an IF amplifier by way of a second converter. The cooling fluid flow passes through the heat exchanger.