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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 ...
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 ...
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 ...
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.
The banjo style of wooden case usually features a round opening for a painted dial, a long-waisted throat, and a rectangular pendulum box with hinged door. Both the throat and door are ornamented with reverse-painted (verre églomisé) glass panels, and the case is usually flanked by curved and pierced brass frets.
In 2-dimensional geometry, a lens is a convex region bounded by two circular arcs joined to each other at their endpoints. In order for this shape to be convex, both arcs must bow outwards (convex-convex). This shape can be formed as the intersection of two circular disks.
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