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Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.
The SL66 and its derivatives are equipped with a mechanically-timed focal-plane shutter, using two vertically-traveling cloth blinds; the maximum flash synchronization speed using the focal-plane shutter is 1 ⁄ 30 sec. [4]: 14, 28–30 80 mm and 150 mm lenses with built-in leaf shutters were introduced in January 1970, which enabled much ...
UL-94 is now harmonized with IEC 60695-11-10 and 60695-11-20 and ISO 9772 and 9773. [2] The VW-1 (vertical wire burn) rating is sometimes erroneously associated with UL 94, but it (and some other flammability tests) is described by UL 1581 (Reference Standard for Electrical Wires, Cables, and Flexible Cords).
Focal-plane shutters may also produce image distortion of very fast-moving objects or when panned rapidly, as described in the Rolling shutter article. A large relative difference between a slow wipe speed and a narrow curtain slit results in distortion because one side of the frame is exposed at a noticeably later instant than the other and the object's interim movement is imaged.
It was nominated for being a rare surviving example of a vertical-lift highway bridge based on the designs pioneered by Waddell & Harrington. [5] The Stillwater Lift Bridge was one of two bridges on the St. Croix River between the Interstate 94 bridge in Hudson, Wisconsin , and the U.S. Highway 8 bridge in Taylors Falls, Minnesota , providing a ...
An aerial view of modern Gibraltar, looking north-west. The nature and position of Gibraltar's defences have been dictated by the territory's topography.It is a long, narrow peninsula measuring 5.1 kilometres (3.2 miles) by 1.6 kilometres (1 mile) wide at maximum, with a land area of about six square kilometres (2.3 square miles).
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