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Artesonado in the Throne Room of the Aljafería in Zaragoza, Spain Artesonado in the Tlaxcala City Cathedral, Mexico. Artesonado or Spanish ceiling is a term for "a type of intricately joined wooden ceiling in which supplementary laths are interlaced into the rafters supporting the roof to form decorative geometric patterns", [1] found in Spanish architecture.
An A-frame ceiling can be open to the top rafters. Although the triangle shape of the A-frame has been present throughout history, it surged in popularity around the world from roughly the mid-1950s through the 1970s. It was during the post–World War II era that the A-frame acquired its most defining characteristics.
The four pieces are usually one isosceles right triangle, two right trapezoids and an irregular shaped pentagon. Despite its apparent simplicity, it is a surprisingly hard puzzle of which the crux is the positioning of the irregular shaped piece. The earliest T puzzles date from around 1900 and were distributed as promotional giveaways.
1. Wooden blocks at the side of a spar. 2. Flat plates of iron or wood bolted to the masthead to form angle supports for the cross-trees. [36] 3. The sides of a block or gun-carriage. chief engineer The senior engineering officer (abbreviated ChEng). chine 1. An angle in the hull. 2. A line formed where the sides of a boat meet the bottom. [2]
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Engelmann spruce is preferred because of "wood character and lack of cracking," but Ponderosa pine (Pinus ponderosa) is more commonly used. [7] Because the availability of vigas longer than 15 feet is limited by the size of the trees cut for the purpose, traditional viga -constructed rooms are typically less than 15 feet (4.6 m) wide. [ 8 ]
Goat Canyon Trestle is a wooden trestle in San Diego County, California. [1] At a length of 597–750 feet (182–229 m), it is the world's largest all-wood trestle. [1] [8] [10] [11] Goat Canyon Trestle was built in 1933 as part of the San Diego and Arizona Eastern Railway, after one of the many tunnels through the Carrizo Gorge collapsed.
Because the internal angle of the equilateral triangle is 60 degrees, six triangles at a point occupy a full 360 degrees. The triangular tiling has Schläfli symbol of {3,6}. English mathematician John Conway called it a deltille , named from the triangular shape of the Greek letter delta (Δ).