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Stromberg-Carlson
Stromberg-Carlson was a telecommunications equipment and electronics manufacturing company in the United States. It was formed in 1894 as a partnership by Swedish immigrants Alfred Stromberg (1861 Varnhem, Sweden - 1913 Chicago) and Androv Carlson (1854 Tommared, Sweden - 1925 Chicago). It was one of five companies that controlled the national supply of telephone equipment until after World War II.Cohen, ''The Racketeer's Progress: Chicago and the Struggle for the Modern American Economy, 1900-1940,'' 2004. History In 1894, Alexander Graham Bell's expired. Stromberg and Carlson,Chicago employees of the American Bell Telephone Company (later AT&T), each invested $500 to establish a firm to manufacture equipment, primarily subscriber sets, for sale to independent telephone companies. Stromberg-Carlson was originally located in Chicago, with Carlson managing manufacturing and Stromberg responsible for marketing. Stromberg-Carlson quickly established a reputation for relia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stromberg-Carlson Telephone Manufacturing Co
Stromberg-Carlson was a telecommunications equipment and electronics manufacturing company in the United States. It was formed in 1894 as a partnership by Swedish immigrants Alfred Stromberg (1861 Varnhem, Sweden - 1913 Chicago) and Androv Carlson (1854 Tommared, Sweden - 1925 Chicago). It was one of five companies that controlled the national supply of telephone equipment until after World War II.Cohen, ''The Racketeer's Progress: Chicago and the Struggle for the Modern American Economy, 1900-1940,'' 2004. History In 1894, Alexander Graham Bell's expired. Stromberg and Carlson,Chicago employees of the American Bell Telephone Company (later AT&T), each invested $500 to establish a firm to manufacture equipment, primarily subscriber sets, for sale to independent telephone companies. Stromberg-Carlson was originally located in Chicago, with Carlson managing manufacturing and Stromberg responsible for marketing. Stromberg-Carlson quickly established a reputation for relia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmission Line Loudspeaker
A transmission line loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmission line within the cabinet, compared to the simpler enclosures used by sealed (closed) or ported (bass reflex) designs. Instead of reverberating in a fairly simple damped enclosure, sound from the back of the bass speaker is directed into a long (generally folded) damped pathway within the speaker enclosure, which allows far greater control and use of speaker energy and the resulting sound. Inside a transmission line (TL) loudspeaker is a (usually folded) pathway into which the sound is directed. The pathway is often covered with varying types and depths of absorbent material, and it may vary in size or taper, and may be open or closed at its far end. Used correctly, such a design ensures that undesired resonances and energies, which would otherwise cause undesirable auditory effects, are instead selectively absorbed or reduced ("damped") due to the effects of the duc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kellogg Switchboard & Supply Company
Kellogg company logo as used from the 1920s to the 1950s. The Kellogg Switchboard and Supply Company was an American manufacturer of telecommunication equipment. Anticipating the expiration of the earliest, fundamental Bell System patents, Milo G. Kellogg, an electrical engineer, founded the company in 1897 in Chicago to produce telephone exchange equipment and telephone apparatus. Along with Western Electric, which supplied the Bell System, Automatic Electric supplying General Telephone, and Stromberg-Carlson, also supplying the independent telephone markets, Kellogg shared in the business of providing the bulk of the nation's telephone equipment until after World War II.Cohen, ''The Racketeer's Progress: Chicago and the Struggle for the Modern American Economy, 1900-1940,'' 2004. History Kellogg company logo (c. 1907) Milo G. Kellogg was born into a prominent, wealthy New England family. He attended prep school, and received two degrees in engineering from the University of R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WHAM (AM)
WHAM (1180 kHz) is a commercial clear channel AM radio station in Rochester, New York, United States. It is owned by iHeartMedia and airs a news/talk radio format. The studios and offices are at Five Star Bank Plaza in downtown Rochester. Its 50,000-watt non-directional transmitter, located in Chili, New York, operates the maximum power for commercial AM stations in the United States and Canada. During the day, it provides at least secondary coverage to all of Western New York, including Buffalo. It can also be heard in much of Southern Ontario, including Toronto, Peterborough, and Kingston. At night, WHAM can be received across much of the Eastern United States and Eastern Canada with a good radio. It is the Emergency Alert System's primary entry point station for Western New York. Programming WHAM carries two local newsblocks on weekdays: ''The WHAM Morning News'' and ''The WHAM 5 O'Clock Hour News''. Local talk shows are Bob Lonsberry and ''Talking Back with Shannon Joy' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Independent Telephone Company
An independent telephone company was a telephone company providing local service in the United States or Canada that was not part of the Bell System organized by American Telephone and Telegraph. Independent telephone companies usually operated in many rural or sparsely populated areas. United States The second fundamental Bell patent for telephones expired on 30 January 1894, which provided an opportunity for independent companies to provide telephone services, although some had been established before that date. The Strowger Automatic Telephone Exchange company had been formed on 30 October 1891. The first Strowger switch went into operation on 3 November 1892 in LaPorte, Indiana, with 75 subscribers and capacity for 99. Independent manufacturing companies were established, such as Stromberg-Carlson in 1894 and Kellogg Switchboard & Supply Company in 1897. By 1903 while the Bell system had 1,278,000 subscribers on 1,514 main exchanges, the independents, excluding non-profit r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WROC-TV
WROC-TV (channel 8) is a television station in Rochester, New York, United States, affiliated with CBS and owned by Nexstar Media Group. The station's studios are located on Humboldt Street in downtown Rochester, and its transmitter is located on Pinnacle Hill in Brighton, New York. However, master control and some internal operations are based at Springfield, Massachusetts–licensed Nexstar sister station and NBC affiliate WWLP's studios in Chicopee. Prior to 2021, the WROC studios hosted the master control operations of Nexstar's "virtual triopoly" in the Quad Cities television market of southeastern Iowa and west-central Illinois, which includes fellow CBS affiliate WHBF-TV, CW affiliate KGCW, and Fox-affiliated LMA partner KLJB. History WROC-TV is Rochester's oldest television station, signing on June 11, 1949, as WHAM-TV, an NBC affiliate on channel 6. It was owned originally by Stromberg-Carlson, a telephone equipment manufacturer, along with WHAM radio. The sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CrossReed
A reed relay is a type of relay that uses an electromagnet to control one or more reed switches. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them. Sealed in a long, narrow glass tube, the contacts are protected from corrosion. The glass envelope may contain multiple reed switches or multiple reed switches can be inserted into a single bobbin and actuate simultaneously. Reed switches have been manufactured since the 1930s. Compared with armature-based relays, reed relays can switch much faster, as the moving parts are small and lightweight, although switch bounce is still present. Also, they require less operating power and have lower contact capacitance. Their current handling capacity is limited but, with appropriate contact materials, they are suitable for "dry" switching applications. They are mechanically simple, making for reliability and long life. Memory device A few million reed relays were used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Dynamics
General Dynamics Corporation (GD) is an American publicly traded, aerospace and defense corporation headquartered in Reston, Virginia. As of 2020, it was the fifth-largest defense contractor in the world by arms sales, and 5th largest in the United States by total sales. The company is a Fortune 100 company, and was ranked No. 94 in 2022. Formed in 1954 with the merger of submarine manufacturer Electric Boat and aircraft manufacturer Canadair, the corporation today consists of ten subsidiary companies with operations in 45 countries. The company's products include Gulfstream business jets, Virginia- and Columbia-class nuclear-powered submarines, Arleigh Burke-class guided-missile destroyers, M1 Abrams tanks and Stryker armored fighting vehicles. In 2021, General Dynamics had worldwide sales of $38.85 billion and a workforce of approximately 103,000 full-time employees. The current chairman and chief executive officer (CEO) is Phebe Novakovic. History Electric Boat Ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Film Recorder
A film recorder is a graphical output device for transferring images to photographic film from a digital source. In a typical film recorder, an image is passed from a host computer to a mechanism to expose film through a variety of methods, historically by direct photography of a high-resolution cathode ray tube (CRT) display. The exposed film can then be developed using conventional developing techniques, and displayed with a slide or motion picture projector. The use of film recorders predates the current use of digital projectors, which eliminate the time and cost involved in the intermediate step of transferring computer images to film stock, instead directly displaying the image signal from a computer. Motion picture film scanners are the opposite of film recorders, copying content from film stock to a computer system. Film recorders can be thought of as modern versions of Kinescopes. Design Operation All film recorders typically work in the same manner. The image is fed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WBZA
WBZA (98.9 FM) is an adult hits station in Rochester, New York. It is owned by Audacy, Inc. (formerly Entercom Communications), who purchased the station from Sinclair Broadcasting in 1999. Before its current format, the station played oldies as WBBF (and before that, WKLX) before that station moved to a lower-powered station broadcasting on 93.3 FM. The station's studios are located at High Falls Studios downtown, and its transmitter tower is on Rochester's west side. History The 98.9 frequency in Rochester has been in continuous use since 1947. Before signing on at its current frequency, the direct predecessor of WBZA, then known as WHFM, broadcast in the old 42-50 MHz FM band. Founded as a sister station to WHAM by Stromberg-Carlson, its daily operation dates back to 1939, making it one of the very oldest surviving FM stations in the United States. As WHFM, the programming format was top 40/CHR from the late 1960s until early 1985. In early 1985 the call letters wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ericsson
(lit. "Telephone Stock Company of LM Ericsson"), commonly known as Ericsson, is a Swedish multinational networking and telecommunications company headquartered in Stockholm. The company sells infrastructure, software, and services in information and communications technology for telecommunications service providers and enterprises, including, among others, 3G, 4G, and 5G equipment, and Internet Protocol (IP) and optical transport systems. The company employs around 100,000 people and operates in more than 180 countries. Ericsson has over 57,000 granted patents. Ericsson has been a major contributor to the development of the telecommunications industry and is one of the leaders in 5G. The company was founded in 1876 by Lars Magnus Ericsson and is jointly controlled by the Wallenberg family through its holding company Investor AB, and the universal bank Handelsbanken through its investment company Industrivärden. The Wallenbergs and the Handelsbanken sphere acquired their v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strowger Switch
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics, it is also known as a step-by-step (SXS) switch. History Strowger, an undertaker, was motivated to invent an automatic telephone exchange after having difficulties with his telephone service. He became convinced that the manual telephone exchange operators were deliberately interfering with his calls, leading to loss of business. According to the local Bell Telephone Company manager Herman Ritterhoff, Strowger swore to "get even" with the telephone operators and "put every last one of them out of a job." Ritterhoff claimed that the real cause of Strowger's difficulties was a metal sign hung on his wall over his telephone, causing an intermittent short circuit when blown by the wind. Strowger conceived ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
