In 1789, a French scientist, M. Lenois, made an epoch in the history of Light-houses, and in the progress of civilization as well, when he introduced an improvement in the way of lighting....The wonderful lens...belongs to a diaptric refracting light of the first order, and oil lamps constructed on the Fresnel principle, and placed within lenses of different orders, according to the Light-house they are used for, serve an admirable purpose. Lard oil is found to be the best illuminator....
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