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A vacuum bell jar is placed on a base which is vented to a hose fitting, that can be connected via a hose to a vacuum pump. A vacuum is formed by pumping the air out of the bell jar. The lower edge of a vacuum bell jar forms a flange of heavy glass, ground smooth on the bottom for better contact. The base of the jar is equally heavy and flattened.
A cloche (from the French for "bell") is a tableware cover, sometimes made out of silver though commercially available as glass, stoneware, marble, or other materials. They often resemble a bell, hence the name.
Parisian market gardens in the 1800s used 18-inch diameter bell-shaped glass jars (cloches) to protect plants in cold weather. They were used to protect everything from young seedlings to mature plants. Notched wooden sticks were used to prop up and vent the jars on sunny days, and were placed back down on the soil before nightfall. [2]
Battement en cloche, a classical ballet movement; Bell (instrument), especially in music directions; Cloche (agriculture), a covering for protecting plants from cold temperatures; Cloche (tableware), a silver dish cover; Cloche hat, a close-fitting women's hat; Cloche Leythal Pastalia, a character in the videogame Ar tonelico II: Melody of ...
A lighthouse clock is a type of mantel clock manufactured in the U.S. from 1818 through 1830s by the American clockmaker Simon Willard, having the dial and works exposed beneath a glass dome on a tapered, cylindrical body. They were also made by Simon Willard & Son, a partnership between the clockmaker and his son Simon Willard Jr. created in 1823.
Domes built in the 16th, 17th, and 18th centuries relied primarily on empirical techniques and oral traditions rather than the architectural treatises of the time, but the study of dome structures changed radically due to developments in mathematics and the study of statics. Analytical approaches were developed and the ideal shape for a dome ...
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