8283e. REVOLVING LANTERNS FOR LIGHTHOUSES. Scientific American. September 26, 1903.
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8283e. REVOLVING LANTERNS FOR LIGHTHOUSES. Scientific American. September 26, 1903.
8283e. REVOLVING LANTERNS FOR LIGHTHOUSES. Scientific American. September 26, 1903. Full issue. Full page article illustrated with seven photographs, discusses the difficulties encountered in attempting to manufacture Fresnel lenses in this country and thus the need to continue to purchase from France. Types of lenses are described with the mechanism necessary to revolve them. Six photographs detail the types of lenses, revolving machinery and lamps within including flashing lantern [lens] with colored sides, four-sided flashing lantern [lens], and flashing lantern [lens] with reflecting prism. One of the relatively few articles detailing lens and revolving mechanisms. Some wear to edges and at fold. (VG-). $24.