The purpose of this study was to investigate experimentally the flow of a jet of air over a curved surface. Only the area upstream of the point on the surface, where the flow ceases to follow the curvature, was considered. Along a longitudinal cross section of the jet, measurements were taken and the static pressure distribution, velocity distribution and flow direction were recorded. No close investigation of the boundary layer at the cylindrical surface nor of the mixing zone at the free jet boundaries was made. It was hoped to obtain a criterion as to the "stability" of the jet, i.e. how long the flow follows the· curved surface before breaking away.