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Another term is 'concertina' doors, inspired by the musical instrument of the same name. Folding doors can be used as internal or external room dividers and are made from a variety of materials. Most folding doors are glazed and the panels have frames of either wood, aluminium or upvc. They can open up and fold either internally or externally ...
There was what might be called a concertina craze on: innumerable coils of barbed wire were converted into concertinas by the simple process of winding them round and round seven upright stakes in the ground; every new lap of wire was fastened to the one below it at every other stake by a twist of plain wire; the result, when you came to the ...
A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It consists of expanding and contracting bellows, with buttons (or keys) usually on both ends, unlike accordion buttons, which are on the front. The concertina was developed independently in both England and Germany. [1]
The most notable innovations to the internal construction of the Chemnitzer concertina were made by German-American instrument builders in Chicago: Ernest Glass patented an aluminum action in 1912 (U.S. patent 1,024,771), which was quicker and quieter than earlier wooden actions; his son Otto further improved this action in 1928 (U.S. patent ...
The effectiveness of any wire obstacle is greatly increased by planting anti-tank and blast antipersonnel mines in and around it. Additionally, connecting bounding anti-personnel mines (e.g. the PROM-1) to the obstacle with tripwires has the effect of booby-trapping the obstacle itself, hindering attempts to clear it.
George Jones is often credited as the first English chromatic Anglo concertina maker. British firms active in the late 19th and early 20th centuries include those founded by Charles Wheatstone, Charles Jeffries (who built primarily Anglo-style concertinas), Louis Lachenal (who built concertinas in both English and Anglo styles and was the most prolific manufacturer of the period), and John Crabb.
The famous floating “door” that has caused endless heated debates since 'Titanic's 1997 release has sold for $718,750 at auction. Titanic Door Prop Sells at Auction for Hundreds of Thousands ...
The Carlsfelder concertina (German: Carlsfelder konzertina) is a member of the German concertina family developed by Carl F. Zimmerman, ...