In experiments on the dispersion of organic phases into aqueous phases, drops were generated continuously at narrow slots of width 12 mum less than or equal to w less than or equal to 125 mum mounted peripherally and normal to the radius in a 'Hi-Gee' centrifugal contactor. The drops formed at an array of sources attributed to the Rayleigh-Taylor instability distributed an average distance lambda similar or equal to 2 pi root2 sigma/Delta pg apart where a is the interfacial tension of the phases, Delta rho their density difference and g the applied centrifugal acceleration. Measured Sauter mean drop diameters were in the range 0.48 to 1.00 mm. The average drop size, d, was given by d approximate to d * (3)root sigma/Delta rhog where d* = 0.1538 +/- 0.0016 m(1/3) is a measured capillary factor. Drop size was marginally affected by inertial forces at the highest flow rates.