Unfortunately wind speeds causing vibration did not oblige by corresponding to these resonances so conductor fatigue failures at the damper clamps again caused problems.

Because it was known (or thought) that conductor tension was the main cause of aeolian vibration, it became the practice for stockbridge dampers to be applied only at tension towers on most transmission lines in Australia from 1950 through to 1975 - Ref 2. This practice led to many fatigue failures of conductors at suspension points, until it was realised that the static bending stresses at suspension clamps, when added to the dynamic bending reversal caused by vibration was the main cause of vibration induced failures. At tension towers the conductors were hinged in line with the sag of the span, so there were no bending stresses, either static or dynamic at those places. Indeed the conductor jumper at tension towers served as an effective "Bate" damper anyway.

A small number of "TEBO" Dumbbell torsional dampers were installed on the Homebush-Tallawarra 132kV line in 1952. These were invented by H. TEBO of Ontario Hydro and used in large numbers in Canada for many years. Whilst they were subsequently abandoned because of inefficiency at most frequencies and a tendency to freeze up they are still in service in NSW on the original line (Figure 10) and on some lines in Western Australia.

Some ELGRA dampers from Sweden were installed on the first 330kV lines emanating from the Snowy River. These consisted of a number of weights resting on elastomer pads around a central rod suspended vertically. They were subsequently discarded from service in Sweden and elsewhere because of excessive wear at the connecting rod joint (Figure 11).