The polarization in elastic $p\ensuremath{-}p$ and $p\ensuremath{-}n$ scattering at 315 Mev has been measured as a function of the scattering angle. The maximum polarization observed in each of these interactions is approximately 40 percent. A similar measurement of the polarization in $p\ensuremath{-}p$ scattering at 276 Mev is also reported. Triple-scattering experiments have been performed to measure the depolarization $D(\ensuremath{\theta})$ and the rotation $R(\ensuremath{\theta})$ in the proton-proton interaction. These parameters have been measured for center-of-mass scattering angles ranging from 22 to 80 degrees.Expressions for the measured quantities in terms of 14-phase shifts of the proton-proton system for $Jl~6$ and $ll~5$ are included. Two of the phase shifts represent mixing between states of the same total angular momentum $J$, spin $S$, and parity. Five sets of phase shifts are reported which satisfy 36 measurements of total cross section, relative differential cross section, polarization, depolarization, rotation, and supplementary conditions imposed by the analysis of information from the reaction $p+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}+d$.