The liquid-liquid and the vapor-liquid phase equilibria of the ternary system 1-butanol + water + 2-propanol have been measured at ambient pressure. Compositions along the binodal curve have been determined gravimetrically at 0, 20, 50, and 60 degrees C. Tie lines were determined for 0, 20, and 60 degrees C. The data were compared to reported measurements at 80 degrees C. Furthermore, the vapor-liquid equilibrium at ambient pressure has been measured for both one-phase and two-phase liquid mixtures using a recirculation still proposed by Rock and Sieg.