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Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...
Sealed bottles have an applied glass seal on the shoulder or side of the bottle. The seal is a molten blob of glass that has been stamped with an embossed symbol, name or initials, and often it included a date. Collectors of bottles sometimes refer to them as Applied seals, Blob seals or Prunt seals.
The white opaque "glue" between the panel and the funnel of a colour TV cathode ray tube is a devitrified solder glass based on the system PbO – ZnO – B 2 O 3.While this is a glass-ceramic-to-glass seal, the basic patent of S.A. Claypoole considers glass-ceramic-to-metal seals as well.
The base and knop were made of gold-plated silver using the lost-wax method, while the cup, made of the same material, was created through embossing. It contains technical details including finely wrought repoussé leaves with other metalwork features that mark it as "Tuscan Gothic"; [1] both its form and technique were widely copied. [10]
The cylinder seals themselves are typically made from hardstones, and some are a form of engraved gem.They may also use glass or ceramics, like Egyptian faience.Many varieties of material such as hematite, obsidian, steatite, amethyst, lapis lazuli and carnelian were used to make cylinder seals.
The seal-making device is also referred to as the seal matrix or die; the imprint it creates as the seal impression (or, more rarely, the sealing). [1] If the impression is made purely as a relief resulting from the greater pressure on the paper where the high parts of the matrix touch, the seal is known as a dry seal ; in other cases ink or ...
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Chasing (French: ciselure) or embossing is a similar technique in which the piece is hammered on the front side, sinking the metal. The two techniques are often used in conjunction. Many metals can be used for chasing and repoussé work, including gold, silver, copper, and alloys such as steel, bronze, and pewter.