Figure 6.

Example of a strong knot: (a) mounted on pendulum; (b) with attached free-end weights (ζ) to simulate added inertia effects; (c) partially failed (diminished loop indicated by ν); and (d) completely failed (absent loop indicated by $\tilde{\nu }$). It should be noted that the knot shown in (c) has a diminished loop size and extended free ends compared to the knot displayed in (b). (Online version in colour.)