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Labyrinth seals are also found on pistons, which use them to store oil and seal against high pressure during compression and power strokes, as well as on non-rotating shafts. In these applications, it is the long and difficult path and the formation of controlled fluid vortices plus some limited contact-sealing action that creates the seal.
The Christmas Seal Catalog (PDF). The Christmas Seal and Charity Stamp Society. 2014. The Christmas Seal Catalog is a simplified version of Green's Catalog of TB Seals of the World, part 1, U.S. National Christmas Seals. Green, Dick (1946) [1936-1937]. Green's catalog of the tuberculosis seals of the world (revised through 1946) Pt. 1-3.
This Catalog is divided into 10 sections which catalog hundreds of fundraising seal issuing societies such as, Easter Seals (U.S.), Boys Town (organization) listed in the Catholic section, National Wildlife Federation, listed in the Pets, Plants, and Wildlife section, and National Association for the Advancement of Colored People listed in the ...
In mechanical engineering, an end-face mechanical seal (often shortened to mechanical seal) is a type of seal used in rotating equipment, such as pumps, mixers, blowers, and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this ...
Cryogenic seals provide a mechanical containment mechanism for materials held at cryogenic temperatures, such as cryogenic fluids. Various techniques, including soldering and welding are available for creating seals; however, specialized materials and processes are necessary to hermetically entrap cryogenic constituents under vacuum-tight conditions.
A bonded seal commonly seals between bolt head and body. In mechanical engineering, a bonded seal is a type of washer used to provide a seal around a screw or bolt. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers. [1] Now widely manufactured, they are available in a range of standard sizes and materials [2 ...
Seal of Solomon – Signet ring attributed to the Israelite king Solomon; Sigil of Baphomet – Official insignia of the Church of Satan; Sigillum Dei – Seal of God, or Seal of Truth, according to John Dee; Sympathetic magic – Type of magic based on imitation or correspondence; Veve – Religious symbol commonly used in different branches ...
The Marshall superchargers were initially manufactured by Marshall Drew and Co Ltd in the 1930s and marketed for increasing car performance. [2] Toward the end of the 1930s Marshall superchargers were listed by Sir George Godfrey and Partners (Holdings) Ltd of Hanworth, Middlesex, made by them to the designs of J.W. Marshall. [3]