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Lapidary (from the Latin lapidarius) is the practice of shaping stone, minerals, or gemstones into decorative items such as cabochons, engraved gems (including cameos), and faceted designs. A person who practices lapidary techniques of cutting, grinding, and polishing is known as a lapidary or lapidarist.
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 ...
The Edison Diamond Disc Record is a type of phonograph record marketed by Thomas A. Edison, Inc. on their Edison Record label from 1912 to 1929. They were named Diamond Discs because the matching Edison Disc Phonograph was fitted with a permanent conical diamond stylus for playing them.
The company was motivated by the success of their competitors in the Canadian diamond fields beginning in 1991. [ 9 ] True North Gems hired local residents from Qeqertarsuatsiaat and Nuuk, the capital of Greenland, to help explore the district and, over the course of the next three years, increased the number of ruby occurrences known from six ...
The slab is then trimmed near the marked line using a diamond blade saw—called a trim saw. Diamond-impregnated wheels or silicon carbide wheels can be used to grind the rough rock down. Most lapidary workshops and production facilities have moved away from silicon carbide to diamond grinding wheels or flat lap disks. [citation needed]
A drone hit the wing of a Canadair CL-415 Super Scooper plane fighting the LA fires. Cal Fire only has one other Quebec 1 aircraft in its arsenal.