The interlocking rings are an Austin Transformer [1]. It&#x27;s the only way to feed electricity to the aircraft warning beacons on the tower without frying the power supply for the light bulbs.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Austin_transformer" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Austin_transformer</a>