A really, really big candle!
A big flame, concentrated by mirrors and lenses. In the 1800s they used mostly whale oil, then lard oil, then kerosene, and then electricity.
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A really, really big candle!
ReplyDeleteA big flame, concentrated by mirrors and lenses. In the 1800s they used mostly whale oil, then lard oil, then kerosene, and then electricity.
ReplyDelete