We describe the CDF Central Outer Tracker (COT), an open-cell drift
chamber currently being constructed for the CDF detector to run at the
upgraded Fermilab Tevatron collider.  This detector will provide central
tracking with excellent momentum resolution in the high-density environment of
a hadron collider.  It will be able to resolve 132 ns beam crossings and
provide tracking trigger information to the Level 1 trigger.  The design is
based upon the existing and successful CDF Central Tracking Chamber.  The
preliminary mechanical and electrical designs are presented.