A detailed investigation of the turbulent boundary layer on a flat plate of finite aspect ratio at zero incidence has been made, incorporating measurements of mean velocity profiles and skin friction over one surface of the plate. Skin friction was measured using Prof. Preston's surface-tube technique with the N.P.L. calibration, and this is justified by comparison with the measured momentum defect.nThese results are compared with others recorded on a 'two-dimensional' plate (i.e. one that spanned the wind tunnel), and the effects of the streamwise edges on the boundary-layer flow on the plate surface are shown to be limited to regions of the plate surface near the edges of the order of a boundary-layer thickness in width.
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