Lighthouses Honor - Advanced

Arts & Crafts

Requirements

  1. Have the Lighthouses Honor.

    Answer: You must have previously completed the basic Lighthouses Honor, proving knowledge about: what a lighthouse is and its function (nautical signaling), the basic types of coastal and harbor lighthouses, the main lighthouses of your country, the function of each part (tower, lantern, dome, lens), the basics of how the light and rotation work, and its historical importance for navigation. — The Brazilian Navy maintains the Nautical Signaling Service (Admiral Moraes Rego Nautical Signaling Center), responsible for more than 5,000 nautical signals along the Brazilian coast, including about 250 active lighthouses administered since the service was created in 1932.

  2. Make a scrapbook, including the following:
    • Photos, prints, postcards, or drawings of 25 lighthouses with a caption containing the location, year of construction, whether active or inactive, and the order of the lenses. At least 5 of the photos must be taken by you.
    • A summary of the history of each of the lighthouses.
    • Drawings, photos, and the answers to all the requirements of this honor.

    Answer: Assemble a physical or digital SCRAPBOOK with: (1) 25 illustrated LIGHTHOUSES — photos, postcards, prints, or drawings. Each one with a caption containing location, year of construction, status (active/inactive), and lens order. — The Barra Lighthouse in Salvador is the oldest lighthouse in the Americas — built by the Portuguese as the Fort of Santo Antônio da Barra and already operating as a lighthouse since the late 17th century (around 1698). In 1839 it received a Fresnel lens, modernizing its signaling; it is a historical and tourist landmark of the Bahia coast.

  3. What is the name of the inventor of the Fresnel lens? In which country and year was it developed?

    Answer: Inventor: AUGUSTIN-JEAN FRESNEL (1788-1827), a French physicist and engineer specializing in optics. COUNTRY: FRANCE. YEAR: 1822 — when the first Fresnel lens was installed at the Cordouan Lighthouse (at the mouth of the Gironde estuary, Bordeaux). — Augustin Fresnel also developed the wave theory of light and studied polarization — although he died young at 39 of tuberculosis, he left scientific contributions that shaped all of modern optics; he is considered one of the fathers of optical physics.

  4. Demonstrate in a drawing:
    • How the prisms of Fresnel lenses are used to concentrate light
    • The shape of a bull's-eye lens and describe its purpose

    Answer: FRESNEL LENS PRISMS: draw a cross-section with the light source at the center (at F, the focal point) and dozens of concentric rings of prisms around it. Each ring is cut at a specific angle to refract (bend) and/or totally reflect the diverging light rays that left the source, redirecting them into a horizontal PARALLEL BEAM at the output. — The 'bull's-eye' of the Cordouan Lighthouse has a focal radius of 1.84 m and weighs more than 4 tons — it is the largest Fresnel lens still in operation in the world, classified as a UNESCO World Heritage Site since 2021 in France.

  5. Make a chart listing all types of Fresnel lens, indicating:
    • Order and classification by size
    • The name of at least 1 lighthouse that uses each type of lens

    Answer: There are 7 main ORDERS of Fresnel lenses by focal size: 1st ORDER (focal radius 920 mm — the largest, for transoceanic coastal lighthouses: Cordouan Lighthouse FRA, Gibraltar Island Lighthouse); 2nd ORDER (700 mm — Île d'Yeu Lighthouse FRA). — The classification by orders was standardized at the 1825 international conference — a system used worldwide to this day in museums and in the maintenance of historic lighthouses; the Cabo Frio Lighthouse (BR) has an original 4th-order Fresnel lens imported from France in the 19th century.

  6. Research and describe the history of the lamp rotation mechanism.

    Answer: HISTORY: (1) ANTIQUITY — fixed lights (no rotation) such as the Lighthouse of Alexandria (3rd century BC); (2) 17th-18th CENTURIES — MANUAL rotation by the keeper every 30 minutes; (3) 1781 — a DESCENDING WEIGHTS system (clockwork) invented by Jonas Norberg, Sweden: a hanging weight descended slowly, moving gears that turned the lens — much like a pendulum clock. — The 'mercury bath' reduced the friction of the lens turning over 100 kg of liquid mercury — efficient but toxic, which prompted the switch to electric motors in the 20th century; many historic lighthouses still have the mechanisms preserved as artifacts.

  7. Make a graphic representation of 6 lighthouses, demonstrating the characteristics of their nighttime and daytime light.

    Answer: The flash pattern (called the 'light period') is unique to each lighthouse — it is cataloged in the Brazilian Navy's 'List of Lighthouses'; navigators consult the book to identify which lighthouse they are seeing in the dark by the exact sequence of light signals.

  8. What is a lightship? Why and when is a lightship needed?

    Answer: LIGHTSHIP (Lightship/Lightvessel): it is a VESSEL ANCHORED at a fixed location at sea, functioning as a MOBILE LIGHTHOUSE. It has a mast with a powerful lamp, a nautical siren/horn, and nautical signaling equipment. — The famous Nantucket I lightship, in Massachusetts (USA), was struck in 1934 by the ocean liner RMS Olympic in dense fog, sinking with the loss of 7 crew members — a disaster that accelerated the global replacement by automated buoys in the 20th century.

  9. Read about lighthouse keepers and list some of the dangers they face to carry out their duties.

    Answer: Dangers faced by lighthouse keepers: prolonged isolation and loneliness in remote locations; violent storms with giant waves that could flood or shake the tower; lightning striking the structure; risk of drowning when accessing lighthouses on islets and reefs; nearby shipwrecks requiring risky rescues; illnesses and accidents without immediate medical help; lack of provisions when bad weather prevented supplies from arriving; exposure to toxic mercury vapors used as the rotation bed for the lenses and to fuel gases (oil, kerosene, acetylene); fires in the lantern; and the extreme fatigue of keeping the light lit and the lens turning every night without fail. — Before automation in the 20th century, lighthouse keepers lived for months in isolation with their families in remote towers — the psychologist Pierre Janet described cases of 'lighthouse keeper's neurosis' as a precursor to what we now call chronic isolation disorder in confined environments.

  10. Look for quotations from Ellen White that mention lighthouses and take part in a group discussion about the meaning of these texts. Include a copy of these quotations in the scrapbook you created in requirement 2.

    Answer: Ellen White compares the church to a lighthouse shining in a world of spiritual storm. In 'The Acts of the Apostles' (p. 12), she says: 'The church is the lighthouse that God has placed in this world of storm.' Include 3 quotations in the scrapbook and take part in a discussion about Christian witness. — EGW wrote more than 100,000 pages and frequently uses 'lighthouse' as a metaphor for the church illuminating the lost — the whiteestate.org site lets you search 'lighthouse', finding 50+ quotations in books such as Acts, Christian Service, and Education.

  11. Build a miniature model of a real lighthouse, made of wood or another durable material. Know the name, location, and date the real lighthouse was originally built.

    Answer: Build a miniature of the Barra Lighthouse in Salvador/BA, founded in 1696 and active since 1839. Use balsa wood or MDF for the white cylindrical tower with red stripes, and paper or plastic for the upper dome. Document the measurements, materials, and historical source. — The Barra Lighthouse is the oldest continuously operating lighthouse in the Americas — built by the Portuguese in 1696 as the Fort of Santo Antônio, it was lit in 1696, and the first Fresnel lens arrived in 1839, standardizing modern Brazilian nautical signaling.