In the Institute of Fluid Mechanics of the Engineering University of Braunsweig an extensive program on experimental investigations of secondary flow losses in cascades has been carried out. These investigations are an extension of previous measurements on two-dimensional cascades. The scope and kind of the present measurements is outlined and the evaluation is discussed. The program includes secondary flow effects at blade tip and blade foot for turbine and compressor cascades. The blade section is NACA 8410. There are no fillets at the blade food, and the blade tip is cut off bluntly. The solidity ratio, the blade angle, and the angle of inflow of the cascade have been varied. The losses of the cascades have been obtained from wake surveys in a plane behind the cascade. The distribution of local values of the losses over the blade length and the blade distance is given. From these averaged values have been obtained by integration. The very comprehensive results give a good insight about the magnitude of ghe secondary flow losses, and how they depend on the cascade geometry.