A neutral bar assembly for providing an electrical connection for a wire to a neutral bar, with the neutral bar assembly having a neutral bar and a neutral bar saddle assembly. The filter device is easy to fabricate inexpensively and reliably using existing technology and is compact and more densely packed than devices produced by the prior art, even for low refractive index materials, in that it uses substantially straight rather than curved strip optical waveguides. A plurality of retractable fork members extends from a backstop to the first conveyor to receive a stack. The physiological monitor has a polarized light source for illuminating tissue and a magnetic field generator which creates a magnetic field within the tissue during illumination. The adjusting unit controls the first and second air-conditioners based on the first and second processing throughputs.