The invention that replaced the coal fire in early lighthouses was the use of oil lamps. The text states, 'the first light exhibited in the Tour de Corduan was obtained by burning billets of oak wood' and mentions that subsequent improvements included 'the use of coal instead of wood' and later the introduction of 'the dioptric instruments of M. Fresnel' which further enhanced light production and efficiency ([1]). This shift marked a significant advancement in lighthouse illumination technology.
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