The purpose of the Hall D GlueX DIRC is to utilize Cherenkov radiation to provide supplemental particle identification information for charged particles reconstructed by the GlueX detector.  In particular, the DIRC (Detection of Internally Reflected Cherenkov light) will enhance the ability to separate pions from kaons. The radiator for the DIRC uses four five-meter long ``bar boxes,” each containing twelve fused silica bars. These bar boxes are recycled from the BaBar DIRC detector that was built at SLAC.  The role of the optical boxes that MIT is designing and building is to transport the light from the “bar boxes” to the photon-detector plane.  This light will then be utilized to image the Cherenkov radiation emitted from the bar boxes.