The calorimeter system consisted of three sampling calorimeters (a cylindrical Central Calorimeter and two End Calorimeters), an intercryostat detector, and a preshower detector. The job of the calorimeters and associated subdetectors was the measurement of energies of electrons, photons, and charged and neutral hadrons. This was achieved by letting incident particles traverse multiple layers of dense inert material in which they interacted and created secondary particles. The collection of all such secondary particles is called a shower. The energy of the progenitor particle was shared among many shower particles of much lower energy that ultimately stopped, at which point the shower ended. Between the layers of the inert material there were detectors in which the ionization of the particles was measured. The total ionization signal summed over the shower is proportional to the energy of the progenitor particle.