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On July 2, 1982, Larry Walters (April 19, 1949 – October 6, 1993) made a 45-minute flight in a homemade aerostat made of an ordinary lawn chair and 42 helium-filled weather balloons. [2] The aircraft rose to an altitude of about 16,000 feet (4,900 m), drifted from the point of liftoff in San Pedro, California , and entered controlled airspace ...
The rise (height) of a round arch is limited to 1 ⁄ 2 of its span, [7] so it looks more "grounded" than a parabolic arch [3] or a pointed arch. [7] Whenever a higher semicircular arch was required (for example, for a narrow arch to match the height of a nearby broad one), either stilting or horseshoe shape were used, thus creating a stilted arch and horseshoe arch respectively. [8]
An annual sky lantern festival known as the Kamihinokinai Paper Balloon Festival (上桧木内の紙風船上げ) is held in Semboku, Akita, on February 10 each year. Hundreds of very large lanterns, known as kamifūsen (紙風船), are flown for good luck in the coming year. [12] [13] Lanterns are made of washi, traditional Japanese glassine ...
[6] [7] For an arch of uniform density and thickness, supporting only its own weight, the catenary is the ideal curve. [8] Catenary arches are strong because they redirect the vertical force of gravity into compression forces pressing along the arch's curve. In a uniformly loaded catenary arch, the line of thrust runs through its center. [9] [10]
The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
If one impost is much higher than another, the arch (frequently pointed) is known as ramping arch, raking arch, [90] or rampant arch (from French: arc rampant). [91] Originally used to support inclined structures, like stairs, in the 13th-14th centuries they appeared as parts of flying buttresses used to counteract the thrust of Gothic ribbed ...