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Some discs used for cutting ceramic tile or stone are made from a solid disc with an edge coated with diamond grit. The most common size for these cutting wheels is 4 + 1 ⁄ 2 inches in diameter; however they can range from 2 to 16 inches in diameter with a thickness range from .045 in. to .125 in. Type 1 discs are flat, and type 27 discs have ...
In 1926, an attempt at reviving interest in Edison records was made by introducing a long-playing Diamond Disc which still rotated at 80 rpm but tripled the standard groove pitch to 450 threads per inch by using an ultra-fine groove, achieving a playing time of 24 minutes per 10-inch disc (12 on each side) and 40 minutes per 12-inch disc (these ...
The thick Edison Discs recorded the sound vertically in the groove at a rate of 150 grooves-per-inch (GPI) rather than the typical laterally-cut groove of around 100 GPI, which gave 10-inch (250 mm) Edison discs a longer playing time (up to five minutes) than laterals and could only be played to their full advantage on Edison Diamond Disc ...
Diamond cutting, as well as overall processing, is concentrated in a few cities around the world. The main diamond trading centers are Antwerp, Tel Aviv, and Dubai from where roughs are sent to the main processing centers of India and China. [3] Diamonds are cut and polished in Surat, India and the Chinese cities of Guangzhou and Shenzhen. [4]
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The "Diamond Award" granted by the Recording Industry Association of America (RIAA) recognizes 10 million units sold in the United States. Below are certification thresholds for the United States, United Kingdom, Canada and France. The numbers in the tables are in terms of "units", where a unit represents one sale or one shipment of a given medium.
Normally, tens or hundreds of diamond gang saw blades are used together to saw raw stone blocks. A diamond band saw blade is a flexible closed steel band with diamonds fixed (often by electroplating) on one edge of the band. Diamond blades designed for specific uses include marble, granite, concrete, asphalt, masonry, and gem-cutting blades.
Wood flour is commonly used as a filler in thermosetting resins such as bakelite, and in linoleum floor coverings. Wood flour is also the main ingredient in wood/plastic composite building products such as decks and roofs. Prior to 1920, wood flour was used as the filler in ¼-inch thick Edison Diamond Discs. [18]