This book details the painstaking fabrication of a massive transverse electromagnetic cell (TEM) by the National Bureau of Standards. The purpose of this cell was to allow for experimental electromagnetic interference (EMI) evaluation studies. The author meticulously describes each step in the cell's construction, from procuring materials to bonding its components, providing a comprehensive guide for replicating this complex scientific instrument. Readers interested in the history and techniques of EMI testing or the intricacies of TEM cell design will find this volume an invaluable resource. The detailed insights into the cell's construction provide a deeper understanding of the challenges and rewards of groundbreaking scientific research.