  A simple, intuitive, and low-cost setup for generating and measuring
capillary waves is presented enabling a precise determination of the dispersion
relation for a cylindrical water jet. By setting the phase velocity and
measuring the wavelength of capillary waves directly, this method provides an
intuitive way for students to understand the dispersion relation of a
cylindrical water jet. The setup produced measurements of wavelength versus
phase velocity over a broader range of values than earlier work. The resulting
data are generally consistent with earlier results but show an error of up to
15\% at both the higher and the lower end of the measured range of wavelengths
compared to the theoretical dispersion relation of cylindrical water jets. For
the shorter wavelengths, the deviation is in the opposite direction from that
of earlier work.
