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Lighthouse reflectors are made of copper[1]. The inner surface of the reflector is coated with pure silver, which is capable of receiving a very high polish[1]. The proportion of the two metals is six ounces of silver to sixteen ounces of copper[1].
The burner has to be accurately adjusted so that the flame is exactly in the focus of the reflector; if it were not accurately placed, many of the rays would be reflected off in lines different from those of the direct rays from the flame itself[1].
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