This thesis describes several experiments designed to investigate the structure of fully developed turbulent pipe flow. Mathematical and computational theories describing bounded shear flows are reviewed together with some of the existing experimental data. A geometrically similar wave model description of the turbulence is developed, and the applicability of such a model considered. Measurement of normal velocity spatial correlations using a temperature wake probe are investigated, and the electronic processing perfected for the wake probe. Production methods for such probes are developed but at present have produced no really satisfactory results. Three-dimensional power spectral densities are generated from narrow band space correlations of the longitudinal velocity fluctuations - separations both in the flow direction and transverse to it being varied. The results allow estimation of allowable convection velocities and other properties associable with a stochastic wave description. Models for the energy transfer mechanism are proposed and related to observable correlations in the appropriate velocity components. Techniques for the measurement of the skewness and flatness spectral density are proposed, and preliminary investigation of the wave interaction of longitudinal velocity fluctuations presented. Areas for future experimental development of a stochastic wave model are discussed.