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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 ...
Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. Clocks using only Arabic numerals first began to appear in the mid-18th century. [citation needed] The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Occasionally ...
Jerome began his career in Plymouth, making dials for long-case clocks. Jerome learned what he could about clocks, particularly clock cases, and then went to New Jersey to make seven-foot cases for clocks. In 1816 he went to work for Eli Terry making "Patent Shelf Clocks," learning how to make previously handmade cases using machinery. Deciding ...
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 ...
[8] Clock cases, which come in many different materials, require special consideration and treatment in their own right. Conservators further advise not exposing a clock to a heat source of any kind, including strong sunlight or a mantel over a working fire, as this can cause damage to the clock cases and movements. [8]
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.
To a first order, glass strength increases as the cube of the thickness. Thick lenses at 4:1 to 6:1 aspect ratios will flex much less than high aspect ratio parts, such as optical windows, which can have aspect ratios of 15:1 or higher.
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