Domestic roof constructionDomestic roof construction is the framing and roof covering which is found on most detached houses in cold and temperate climates. Such roofs are built with mostly timber, take a number of different shapes, and are covered with a variety of materials. Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates. Timber framed and historic buildings may be framed with principal rafters or timber roof trusses.
Mouvement propreEn astronomie, on appelle mouvement propre le mouvement apparent des étoiles sur la sphère céleste vue de la Terre. Il fut découvert en 1718 par Edmund Halley lorsqu'il remarqua que les positions de Sirius et d'Arcturus s'écartaient de plus d'un demi-degré de celles mesurées par Hipparque environ 1850 ans auparavant. Il mentionna également qu'une occultation d'Aldébaran par la Lune avait eu lieu en l'an 509. À première vue, les étoiles semblent occuper une position fixe sur la sphère céleste.
Outline of machinesMachine – mechanical system that provides the useful application of power to achieve movement. A machine consists of a power source, or engine, and a mechanism or transmission for the controlled use of this power. The combination of force and movement, known as power, is an important characteristic of a machine.
Lashed-lug boatLashed-lug boats are ancient boat-building techniques of the Austronesian peoples. It is characterized by the use of sewn holes and later dowels ("treenails") to stitch planks edge-to-edge onto a dugout keel and solid carved wood pieces that form the caps for the prow and stern. The planks are further lashed together and to ribs with fiber ropes wrapped around protruding carved lugs on the inside surfaces. Unlike carvel construction, the shell of the boat is created first, prior to being fastened to the ribs.
Plate reconstructionThis article describes techniques; for a history of the movement of tectonic plates, see Geological history of Earth. Plate reconstruction is the process of reconstructing the positions of tectonic plates relative to each other (relative motion) or to other reference frames, such as the Earth's magnetic field or groups of hotspots, in the geological past. This helps determine the shape and make-up of ancient supercontinents and provides a basis for paleogeographic reconstructions.
Boat buildingBoat building is the design and construction of boats and their systems. This includes at a minimum a hull, with propulsion, mechanical, navigation, safety and other systems as a craft requires. Wood is the traditional boat building material used for hull and spar construction. It is buoyant, widely available and easily worked. It is a popular material for small boats (of e.g. length; such as dinghies and sailboats). Its abrasion resistance varies according to the hardness and density of the wood and it can deteriorate if fresh water or marine organisms are allowed to penetrate the wood.
Porte (architecture)En architecture et construction, une porte ( du latin porta) est une baie, une structure (en bois ou métallique), dans un mur permettant d’entrer, ou de sortir, d'un domaine, d'un édifice ou pour circuler dans ses pièces. Dans le langage familier le mot « porte » désigne seulement l'« huis », qui est la menuiserie mobile permettant de fermer ce passage et soutenu par le dormant.
Coin (machine simple)vignette|Coin utilisé pour fendre du bois. Un coin est un outil que l'on peut assimiler à un double plan incliné portatif. Ce dispositif mécanique élémentaire, l'une des huit machines simples, est utilisé pour séparer un objet en deux, pour séparer deux objets accolés, pour maintenir un objet en place ou pour le soulever, en transformant une force appliquée à son extrémité en une force perpendiculaire et de module plus important. Plus l'angle du coin est faible et plus la force résultante est importante.
