This interpretation is not intended to be applied to existing
ships.
Acceptable equivalent means to steel bars should consist
of devices and materials which could provide strength equivalent to,
and elasticity not greater than that of, steel.
Steel wire ropes should not be regarded as satisfactory
equivalent means.
Care should be taken to ensure that tarpaulins are adequately
protected from the possibility of damage arising from the use of securing
devices which do not provide a flat bearing surface.