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  2. Airway beacon - Wikipedia

    en.wikipedia.org/wiki/Airway_beacon

    An aerial lighthouse located in Pansio, Turku, Finland. An airway beacon (US) or aerial lighthouse (UK and Europe) was a rotating light assembly mounted atop a tower. These were once used extensively in the United States for visual navigation by airplane pilots along a specified airway corridor.

  3. History of navigation - Wikipedia

    en.wikipedia.org/wiki/History_of_navigation

    The history of navigation, or the history of seafaring, is the art of directing vessels upon the open sea through the establishment of its position and course by means of traditional practice, geometry, astronomy, or special instruments. Many peoples have excelled as seafarers, prominent among them the Austronesians (Islander Southeast Asians ...

  4. Deck prism - Wikipedia

    en.wikipedia.org/wiki/Deck_prism

    A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below. [1][2][3] For centuries, sailing ships used deck prisms to provide a safe source of natural sunlight to illuminate areas below decks. Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps —all dangerous ...

  5. Navigation light - Wikipedia

    en.wikipedia.org/wiki/Navigation_light

    Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...

  6. Julius Pintsch - Wikipedia

    en.wikipedia.org/wiki/Julius_Pintsch

    Julius Pintsch. Carl Friedrich Julius Pintsch (6 January 1815 – 20 January 1884) was a German tinsmith, manufacturer and inventor who is primarily known for the invention of Pintsch gas. The gas, distilled from naphtha or other petroleum products, was widely used in railway transport and marine navigation applications from its invention in ...

  7. Searchlight - Wikipedia

    en.wikipedia.org/wiki/Searchlight

    ATS officers-in-training crew a 90 cm searchlight in Western Command, 1944. A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction.