I believe thunder effects were done by rolling metal balls down metal chutes/around metal bowls - think of the amount of noise you can get from even one of those small tibetan bowls (can't remember the name) and you get the idea.
Rumbling thunder rather than thunder claps, I would assume.
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timeasmymeasure
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Date: 2004-01-07 01:48 am (UTC)Rumbling thunder rather than thunder claps, I would assume.