It takes 32 miliseconds but keeps relighting so fast that we
don't even realize it.
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Ronald Reagan gave a speech there in honor of the centennial of
the Statue of Liberty and its relighting.
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You should not be relighting the furnace, if your unit does not
have an automatic ignitor you merely need to relight the pilot
light and the instructions to do that specifically for your
equipment can be found somewhere on the unit.
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The smoke from the candle has vaporized wax, which is highly
flammable vs carbon soot. When the flame touches the stream of
vaporized wax (smoke) the heat is transferred back to the wick
relighting it.