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  2. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    The "meatball" light aids the pilot in maintaining proper glide slope for the landing. In the center are amber and red lights composed of Fresnel lenses. Although the lights are always on, the angle of the lens from the pilot's point of view determines the color and position of the visible light.

  3. Liter of Light - Wikipedia

    en.wikipedia.org/wiki/Liter_of_Light

    Liter of Light Bangladesh was started by Shanjidul Alam Seban Shaan under Lights Foundation in 2015 in Chittagong. [14] [15] They made a local version of the bottle light called 'Botol Bati', which costs around $2–2.50 USD and lasts for 4–5 years. They aim to spread awareness of bottle lights to remote areas by training local school students.

  4. BS National Beehive - Wikipedia

    en.wikipedia.org/wiki/BS_National_Beehive

    The National beehive is specifically designed to house frames detailed in the standard. These are 14 in (360 mm) wide, with a height of either 8 + 1 ⁄ 2 or 5 + 1 ⁄ 2 in (220 or 140 mm). In brood boxes, up to twelve frames can be used, but (once propolised), twelve frames are typically too tight a fit for easy use, and eleven frames (with ...

  5. Beehive oven - Wikipedia

    en.wikipedia.org/wiki/Beehive_oven

    A beehive oven is a type of oven in use since the Middle Ages in Europe. [1] It gets its name from its domed shape, which resembles that of a skep , an old-fashioned type of beehive . Its apex of popularity occurred in the Americas and Europe all the way until the Industrial Revolution, which saw the advent of gas and electric ovens.

  6. L. L. Langstroth - Wikipedia

    en.wikipedia.org/wiki/L._L._Langstroth

    Lorenzo L. Langstroth historical marker at 106 S. Front St., Philadelphia PA. Lorenzo Lorraine Langstroth (December 25, 1810 – October 6, 1895) was an American apiarist, clergyman, and teacher, who has been called the father of American beekeeping. [1]

  7. Beehive stone - Wikipedia

    en.wikipedia.org/wiki/Beehive_Stone

    Beehive stones or beehive rocks of Hungary are rock formations, often naturally conical towers, with niches or cavities carved into their sides. A limited number of rocks with niches can be found even close to Budapest , in the area of the Pilis mountains and the Budai-hegység hills , especially on its Tétényi-fennsík plateau.