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...o a supply voltage and the second coil is connected to ground. A telephone exchange relay coil is around 300 Ω, so the two of them together are terminatin ...Its impedance at audio frequencies, and especially at the more restricted telephone band frequencies, is far from constant. It is possible to manufacture this ...

...ting for Wheatstone. Cooke eventually bought out Wheatstone's interest in exchange for royalties.<ref>Bowler & Morus, pages 403–404</ref> ...rd) of one [[shilling]], but many people paid this just to see the strange equipment.<ref>Kieve, page 33</ref> ...

{{term|[[audio equipment]]}} {{defn|Equipment used to handle signals at frequencies within the human range of hearing.}} ...

...s alone were not sufficient to justify the investment in staff and capital equipment required for properly equipped laboratories. His answer was to establish a ...of [[Stoke Poges]]. The name 'Fulmer' was the name of the local telephone exchange and that of a nearby village. ...

...almost entirely military, the encryption technology (techniques as well as equipment and, after computers became important, crypto software) was included as a C ...tates]]" and [[terrorism|terrorist]] organizations. Militarized encryption equipment, [[Tempest (codename)|TEMPEST]]-approved electronics, custom cryptographic ...

...egraphy was developed in the 1830s and 1840s, well before [[History of the telephone|telephony]], and operated worldwide by the time of the [[World War II|Secon ...lugging up the settings as being like operating an old fashioned telephone exchange and that she received electric shocks in the process.{{sfn|Copeland|2006|lo ...

...: Responsible for both the [[Abwehr]] and OKW/Chi's own telecommunications equipment, including deployment and upkeep. It contained two officers and 24 staff. ...eveloped German code and cipher systems (camouflage, codes and ciphers and telephone secrecy) and also advised on the production of keys and the supervision of ...

...the size of rooms that provide standby or emergency power for [[telephone exchange]]s and computer [[data center]]s. Batteries have much lower [[specific ener ...t spilling, as it contains no free liquid, making it suitable for portable equipment. By comparison, the first wet cells were typically fragile glass containers ...

...in New York City, and the addition of an emergency stop button, emergency telephone, and a soothing explanatory automated voice.<ref>{{cite news |url=https://w ...ntaining the elevator car), and a small cabinet houses the controller. The equipment is otherwise similar to that of a normal traction or hole-less hydraulic el ...

...munications. ASCII codes represent text in computers, [[telecommunications equipment]], and other devices. Most modern character-encoding schemes are based on A ...resources. In computer networks, [[computing device]]s [[data transmission|exchange data]] with each other using connections ([[data link]]s) between nodes. Th ...

...ian-American inventor Antonio Meucci, and his work in the invention of the telephone.|last=Fossella|first=Vito|date=2002-06-11|website=www.congress.gov|access-d ...d a voice-communication apparatus that several sources credit as the first telephone.<ref name="Meucci"/>]] ...

...ry, processes in factories, boilers, and heat-treating ovens, switching on telephone networks, steering and stabilization of ships, aircraft and other applicati ...[conjugate acid|conjugate base]], and the base forms its conjugate acid by exchange of a [[proton]] (the hydrogen cation, or H⁺). This theory is a g ...