Abstract: Magnetic brush development apparatus for use in reproduction apparatus in which a support carrying a developable latent image is moved through a development zone which is transversely inclined at a predetermined angle to the horizontal. The development apparatus includes a stationary non-magnetic inclined applicator with a segment located adjacent to the development zone. The applicator is supplied with magnetic developer which is distributed over the surface of the applicator through the influence of gravity and of a magnet assembly rotatably mounted within the applicator. A reservoir associated with the applicator accumulates developer moved about the periphery of the applicator and levels it to produce a uniformly thick layer in the development zone.