The construction of the L3 experiment

The L3 experiment is one of the six large detectors designed for the new generation of electron-positron accelerators. It is the only detector that concentrates its efforts on limited goals of measuring electrons, muonsand photons. By not attempting to identify hadrons, L3 has been able to provide an order of magnitude better resolution for electrons, muonsand photons. Vertices and hadron jets are also studied. The construction of L3 has involved much state of the art technology in new principles of vertex detection and in new crystals for large scale electromagnetic shower detection and ultraprecise muondetection. This paper presents a summary of the construction of L3.