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The sound quality of antique radios depends on the technologies used in the set. The type of speaker is the main differentiator, with mains or battery also making a significant difference. All valve sets produce 2nd harmonic distortion, which is fairly euphonic. Some also produce significant 3rd harmonic distortion, which is less pleasant to ...
A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy , magnetos were used to power instruments, while in telephony they were used to generate electrical current to drive electromechanical ringers in telephone sets and activate signals ...
In 1907, he became a consultant to the nearby French Battery Company (later renamed The Ray-O-Vac Company). He was charged with improvement of the French No. 6 battery [1] — the large 6-inch-tall, single-cell battery used for automobile ignition, railroad signals, telephones, doorbells and other electrical devices. Burgess was put in charge ...
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.
Seeing a way to make a profit in the already competitive lead-acid battery market, Thomas Edison worked in the 1890s on developing an alkaline based battery that he could get a patent on. Edison thought that if he produced a lightweight and durable battery electric cars would become the standard, with his firm as its main battery vendor.
The first incarnation of the New England Telephone and Telegraph Company was a short-lived company set up to develop the then-new telephone.New England Telephone and Telegraph lasted only a year as a separate entity, from 1878 to 1879, and had no direct relationship with the later company of the same name, which after the breakup of the Bell System in 1984 became part of the NYNEX Corporation ...
A typical Western Electric hand telephone set of c. 1930. It consists of a handset mounting with the handset held in a cradle, and a subscriber set mounted against a wall or vertical surface in close proximity. Shown is a B1A hand telephone set, also known as the type 102B-3 hand telephone set.
In the interest of improved interoperability of phone battery chargers, major manufacturers have agreed to standardize on the micro-USB connector for new phone chargers from 2010. [16] Many manufacturers make special-purpose DC power connectors for battery packs, instruments, medical equipment, communications equipment and other devices.