Presented is the design, construction, testing and analysis of a multiwire veto chamber constructed for use in a third arm at the Thomas Jefferson National Accelerator Facility. The purpose of the veto chamber was to detect charged particles that are difficult to differentiate from photons in the calorimeter. Charged particles deposit energy in the chamber along their path thereby ionizing the chamber gas. The ions drift towards the cathode and the electrons, in turn, are amplified in the region close to the wires. The current pulse is detected and recorded electronically. Photons are not easily detected by the chamber due to their low probability of interaction with the chamber gas. I present an analysis of actual experimental data obtained that demonstrates that the wire chamber efficiency of detecting charged particles was better than 96% and that the chamber was effective in providing calibration data for the segmented lead glass calorimeter.