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Examples include the closing stone in a string course, cylindrical column drums, decorated column capitals, and coping stones in a pediment. Heavy ashlar stones are also bedded using a lewis. The lewis is liable to slip out of the seating if some of the weight of the stone is subtracted from the appliance, such as when the stone bumps on the ...
Vertical lift bridges in the United States by state or territory (10 C) Pages in category "Vertical lift bridges in the United States" The following 34 pages are in this category, out of 34 total.
Replacing an advertising poster in London using an aerial work platform. An aerial work platform (AWP), also an aerial device, aerial lift, boom lift, bucket truck, cherry picker, elevating work platform (EWP), mobile elevating work platform (MEWP), or scissor lift, is a mechanical device used to provide temporary access for people or equipment to inaccessible areas, usually at height.
The first lift in the United States with the new grip was the High Noon Express at Vail Ski Resort. In 2012, Leitner-Poma adapted a new retro tower design that is a cross of the design of tower heads on Poma chairlifts built in the late 1970s and early 1980s with the design used since 1994.
This mechanism is used in devices such as lift tables and scissor lifts.Modern low-profile computer keyboards make an extensive use of it as well, installing each key on a scissor support to ensure their smooth vertical movement, allowing the use of a cheap and reliable rubber dome contact set, instead of expensive and complex array of mechanical switches.
The most common lift table design incorporates hydraulic cylinders and an electrically powered pump to actuate the scissor lifting mechanism. Lift tables can also be driven by pneumatic sources, trapezoidal-threaded screw drives, push chains or by hydraulic foot pump when the load is not heavy. The choice of drive mechanism depends on factors ...
An aerial lift, [1] also known as a cable car or ropeway, is a means of cable transport in which cabins, cars, gondolas, or open chairs are hauled above the ground by means of one or more cables. Aerial lift systems are frequently employed in a mountainous territory where roads are relatively difficult to build and use, and have seen extensive ...
The patent was titled "Aerial Ski Tramway,' U.S. patent 2,152,235. W. Averell Harriman, Sun Valley's creator and former governor of New York State, financed the project. [24] [25] Mont Tremblant, Quebec opens in February 1938 with the first Canadian chairlift, built by Joseph Ryan. [26] The ski lift had 4,200 feet of cable and took 250 skiers ...
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