A phase space boundary between transition and non-transition, similar to
those observed in chemical reaction dynamics, is shown experimentally in a
macroscopic system. We present a validation of the phase space flux across rank
one saddles connecting adjacent potential wells and confirm the underlying
phase space conduits that mediate the transition. Experimental regions of
transition are found to agree with the theory to within 1\%, suggesting the
robustness of phase space conduits of transition in a broad array of two or
more degree of freedom experimental systems, despite the presence of small
dissipation.Comment: 7 pages, 6 figure
