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Spin casting is a technique for constructing large parabolic mirrors by using the curved surface formed by a rotating liquid (e.g. in a rotating furnace). [1] It is distinct from the spin casting or centrifugal rubber mold casting (CRMC) technique used for casting metal or plastics.
The metal must be molten prior to introduction into the mold. It is necessary for a spin casting furnace to have a temperature controller, as there is an optimal range for each metal. For example, a particular zinc alloy is typically cast between 413 and 427 °C (775 and 801 °F), whereas it actually melts much lower around 260 °C (500 °F).
The next method of spinning yarn is with the spindle, a straight stick eight to twelve inches long on which the yarn is wound after twisting. At first the stick had a cleft or split in the top in which the thread was fixed. Later, a hook of bone was added to the upper end. The bunch of wool or plant fibres is held in the left hand.
You've likely seen warnings against taking aspirin as a preventative measure against heart attack and stroke. It isn't quite that simple.
In public relations and politics, spin is a form of propaganda, achieved through knowingly providing a biased interpretation of an event. While traditional public relations and advertising may manage their presentation of facts, "spin" often implies the use of disingenuous, deceptive, and manipulative tactics. [1]
Comcast just jump-started a new season of major change across the television industry. And no one quite knows what will happen next.
A local news reporter is going viral after a blooper she posted caught the attention of the internet. Teagan Brown, a weekend sports anchor and reporter at Myrtle Beach, South Carolina, NBC ...
The need for a high linear tape speed was made unnecessary with the introduction of the professional Quadruplex system in 1956 by Ampex, which segmented the fields of a television image by recording (and reproducing) several tracks at a high-speed across the width of the tape per field of video by way of a vertically spinning headwheel with ...