  We present pulse phase spectroscopy of A 0535+26 in the energy range 35-200
keV from OSSE observations of its giant outburst in 1994. We discuss the phase
dependence of the continuum parameters and the cyclotron resonance feature
(CRF) at 110 keV already found in the phase averaged spectrum. We find that a
CRF is required at every phase. The behaviour of the line parameters with phase
and the pulse shape indicate that the emission occurs in a pencil-beam
geometry.
