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BC, you show a movie of an 'al fresco' version of the Shive machine,
which was designed to provide a visual illustration of slow transverse
wave propagation and reflections. I am afraid your note does not specify
if the movie shows the effect of a fixed, or of a free end. The
illustration I provide (below) has three still pictures showing the
effect of a fixed or a free end. [If your browser does not depict these
three still pictures across the width of your display, you may find the
description confusing.]
The fixed end reflects an inverted pulse (not 'phase-reversed' as
described) whereas the free end reflects an isopolar pulse.
An end provided with the same acoustic impedance as the loaded
transmission rod would be expected to minimize reflections of either type.
<http://www.physics.umd.edu/lecdem/services/demos/demosg3/g3-03.htm>
Brian W