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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 ...
Conservation experts advise clocks need to be serviced regularly. A clock is a complex mechanical contraption made of a variety of materials and with many small moving parts. [10] Even under perfect conditions lubricants deteriorate. Clocks should be examined and re-lubricated every three years.
But much of the light was wasted by absorption in the glass. [6] [7] In 1748, Georges-Louis Leclerc, Comte de Buffon was the first to replace a convex lens with a series of concentric annular prisms, ground as steps in a single piece of glass, [2] to reduce weight and absorption.
The upper part was the clock face, the lower part was either a mirror or a picture back-painted on glass. Despite the small size of the clocks compared with traditional long case clocks, Terry was able to provide sufficient power through gearing for the clock to run a full thirty hours before it needed to be rewound.
The most interesting thing about the second reference, the one from King Charles, is that a common sand-glass is defined as "ung grant orloge de mer" or "a large sea clock", this together with the fact that the first explanation of its use at sea (found by M.Llauradó) appears in the Francesc Eiximenis work "lo dotzé del crestià" and that was ...
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
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