Name : Paul Sommers Institute : University of Utah E-mail : sommers@physics.utah.edu TITLE : The Auger Fluorescence Detector ABSTRACT : A key feature of the Auger Observatory design is its capability for "hybrid" measurement of air showers. The longitudinal shower development is measured by an atmospheric fluorescence detector and used in conjunction with shower particle density measurements made at ground level by the surface array. Combined timing gives excellent geometric reconstruction. The subset of hybrid showers will yield extra information for composition analysis, and it will provide a precision energy distribution with unambiguous exposure. Also, the solid hybrid measurements will form a standard for minimizing systematic errors in the surface array reconstruction methods. The design of the Auger fluorescence detector is based on the Fly's Eye and HiRes experience. A new electronics system has been developed, and a Schmidt optics system gives each telescope a large field of view (30x30-degrees). The Fly's Eye "Winston cones" have become smaller "mercedes" light collectors. Italian and German collaborators have spearheaded the production of two prototype telescopes in Argentina for commissioning and evaluation this year.