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Under Frederick the Great the acid resistance of porcelain was used for laboratory and pharmacy equipment. In 1849 the first ceramic bell insulator was used on the telegraph route between Frankfurt and Berlin. In 1891, porcelain insulators were presented for the first time at the International Electrotechnical Exhibition in Frankfurt. The ...
Porcelain has been used for electrical insulators since at least 1878, [59] with another source reporting earlier use of porcelain insulators on the telegraph line between Frankfurt and Berlin. [60] It is widely used for insulators in electrical power transmission system due to its high stability of electrical, mechanical and thermal properties ...
It primarily produces insulators but also produces other products, especially ceramic products. NGK is headquartered in Tokyo (Marunouchi Bldg. 25F, 2-4-1, Marunouchi, Chiyoda-ku, Tokyo 100–6325) and is listed on the Nikkei 225 , which is an index of the Tokyo Stock Exchange . [ 2 ]
The museum contains some unique items, including a "pin insulator for communication" manufactured in 1875 that is believed to be the oldest domestic Japanese insulator. [citation needed] It has "approximately 5,000 pieces of insulators and maintenance tools from 21 countries... and 57 manufacturers."
Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm. [8] Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains. [9]
From 1864 to 1869, the firm was known as Thomas C. Smith and Company, but the factory itself continued to be called the Union Porcelain Works. In its first decade, its products were limited to sturdy white china plates and dishes for the hotel trade, electrical insulators, hardware trimming, and decorated tiles.
An insulator of a telephone transmission line A pin insulator ceramic plate used for 20 KV lines. A pin insulator is a device that isolates a wire from a physical support such as a pin (a wooden or metal dowel of about 3 cm diameter with screw threads) on a telegraph or utility pole.
Victor Insulators, Inc. based in Victor, New York (founded 1893 by Fred M. Locke) is the oldest insulator company in North America. They originally made glass insulators for electrical lines. They suspended operations during the Great Depression , but resumed operations in 1935 as Victor Insulators.
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