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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 ...
The face may also include a second hand, which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has ...
Beveled glass has also been used with clear and colored textured glass to create designs. Textured glass is typically 1 ⁄ 8 inch (3 mm) thick and has a distinct visible texture. Beveled glass is typical made from 1 ⁄ 4 inch (6 mm) float plate glass but thicknesses up to 1 ⁄ 2 inch (10 mm) have been used for larger windows. The width of ...
Any excessive physical force will break, damage, splinter the clock frame or easily shatter the glass of the object. Clocks are complex functional objects; many have moveable working parts. Any excessive physical force can damage the mechanics inside the clock which are critical to its operation.
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 ...
A list of permanent working clocks with the largest faces in the world. Entries include all clocks with faces at least 4 m (13 ft) in diameter. Clocks can be located on the exterior or interior of buildings, and towers as well as on the ground as is the case with floral clock faces.
Clocks from Winterhalder & Hofmeier are mechanical precision clocks with the quality standards of Black Forest craftsmanship. [4] [5] The numbers of the dial face are in Roman numerals. The dial face is embraced by wood. [6] The clocks can be identified by the engraved W & H SCH initial letters. Most of the clocks were made from 1850 to 1933.
2. The gear trains used in clocks and watches have multiple stages of wheels and pinions in which the pinions have few leaves. Involute designs for these leaves would be undercut, making them too fragile and difficult to manufacture. 3. A large aspect of the design of watch and clock movements is the minimisation of friction.
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