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Digest>Sep/Oct 2021 |
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Photo Caption:
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Scaled models of Fowey Rocks (center front) and Minot’s Ledge (far right) lighthouses were displayed at the 1893 World’s Columbian Exposition in Chicago along with a variety of lighting apparatus, including a hyperradial lens, first and second order Mahan system lenses, fourth order revolving lens, fifth order lens with occulting chimney, range lenses, 5-day and 8-day lens lanterns, light vessel lantern with lamps and reflectors, hand lanterns and electric buoy lanterns, some of which are shown in this photo. (National Archives)
Back to the edition of: Sep/Oct 2021
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Story:
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Frederick Goes to the Fair
Back to the edition of: Sep/Oct 2021
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