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The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain".This photographic reproduction is therefore also considered to be in the public domain in the United States.
Panel paintings consist of a wood support, a ground (linen or parchment sized with glues, resin, and gesso), and an image layer (encaustic, tempera, oil). [1] They are typically constructed of two or more panels joined together by crossbeam braces which can separate due to age and material instability caused by fluctuations in relative humidity ...
Rails are frequently measured in weight per yard, such as 135 pounds (61 kg) per yard (0.91 m). Through the mid to late 20th century, rails were typically bolted together, this has given way to continuously welded rails that have fewer joints. [5] Rails are secured to the ties using a fastener. With wood ties, spikes are commonly used.
Panels are made slightly smaller than the available space within the frame to provide room for movement. Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door.
Cast iron rails, 4 feet (1.2 m) long, began to be used in the 1790s and by 1820, 15-foot-long (4.6 m) wrought iron rails were in use. The first steel rails were made in 1857 and standard rail lengths increased over time from 30 to 60 feet (9.1–18.3 m). Rails were typically specified by units of weight per linear length and these also increased.
A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.
The most common residential deck railing design is built on-site using pressure treated lumber, with the vertical balusters regularly spaced to meet building code. [1] Wood railing could be in different styles such as Victorian, Chippendale railing and others. [2] A popular alternative to wood railing is composite lumber and PVC railing. [3] [4 ...
Steel ties are common on secondary lines in the UK; [1] plastic composite ties are also employed, although far less than wood or concrete. As of January 2008, the approximate market share in North America for traditional and wood ties was 91.5%, the remainder being concrete, steel, azobé (red ironwood) and plastic composite.