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Abstract. Mean flow and turbulence measurements have been made in a boundary layer which grows first on a flat wall and then on a convex wall of radius of curvature approximately 100 times the boundary layer thickness. The turbulence data include profiles of the four non-zero components of the Reynolds stress tensor and three triple velocity products obtained at five stream-wise positions. A number of measurements were also made for comparison i the boundary layer on a flat wall under the same conditions. The effects of convex curvature are to reduce turbu-lent intensities, hear stress and wall friction by approximately 10 % of their plane flow values; the triple velocity products are halved in the curved layer. The measurements supplement the small quantity of previously published ata available for testing mathematical models of turbulence. The r sults show the same general trends that have been observed in earlier investigations but there are significant differences in detail, notably in respect of levels of the normal stresses