Researchers fired rockets trailing conductive wires into thunderclouds to trigger lightning strikes, which were then analyzed by instruments carried on the ship's deck.
This meant that the longitudinal tension of the snare wires could be adjusted independently of the vertical force holding the snares against the bottom head.
The border includes symbolic "doorways" using utility poles to hold upright supports for wires serving as the lintels, or overhead portion, of the doorframe shape.
