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A watch glass is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance, and as a cover for a beaker. When used to cover beakers, the purpose is generally to prevent dust or other particles from entering the beaker; the watch glass does ...
A building's surface detailing, inside and outside, often includes decorative moulding, and these often contain ogee-shaped profiles—consisting (from low to high) of a concave arc flowing into a convex arc, with vertical ends; if the lower curve is convex and higher one concave, this is known as a Roman ogee, although frequently the terms are used interchangeably and for a variety of other ...
Later the mirror, especially if it is circular and convex, may be called girandole by itself without the candle holders. [3] The wall-mounted lighting device is a common definition of girandole in English today. [13] [5] [14] Some large dressing glasses of the 19th century were known as "girandoles" because of the lighting devices mounted to ...
Round convex mirrors called Oeil de Sorcière (French for "sorcerer's eye") were a popular luxury item from the 15th century onwards, shown in many depictions of interiors from that time. [3] With 15th century technology, it was easier to make a regular curved mirror (from blown glass) than a perfectly flat one.
Emigh-Winchell Hardware Company: 1920s. Santa Claus is front and center in this display within a window display circa 1920s that's all about toy trucks, cars and bikes.
This occurs between water and glass. Water-based fluids like sap, honey, and milk also have a concave meniscus in glass or other wettable containers. Conversely, a convex meniscus occurs when the adhesion energy is less than half the cohesion energy. Convex menisci occur, for example, between mercury and glass in barometers [1] and thermometers.
"I [thought to myself], ‘Oh, no, this is not going to happen today,’ ” Linda Rosa recalled of the incident
Regarding the mechanism, towards the end of the 18th century, round clock movements became a reliable mass-produced product. Known as "Pendule de Paris" (Paris, or French, clock movements), they were an 8-day movement with anchor escapement, silk thread suspended pendulum with a count wheel striking on a bell every hour and half-hour. By the ...
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