In the foregoing paper, the characteristics of the time-mean and fluctuating forces acting on two rectangular prisms in tandem arrangement placed vertically in a turbulent boundary layer were described. As a continuation of the foregoing paper, the behavior of the aerodynamic forces of two prisms in side by side arrangement were investigated experimentally. The results were summarized in several figures from which one can obtain the time-mean drag and lift, the fluctuating drag and lift, and the Strouhal number for the various spacing between the two prisms. Further, they variation of the flow pattern with the spacing between the two prisms were discussed in detail based on the variation of Strouhal number, and cross correlation between the fluctuating pressure acting on the two prisms. In particular, it was found that the variation of the Strouhal number with the spacing between the two prisms can be classified into four regions.