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The receiver was mounted on the head by a clamp which held it next to the ear. [9] The head mount freed the switchboard operator's hands, so that they could easily connect the wires of the telephone callers and receivers. [10] The head-mounted telephone receiver in the singular form was called a headphone. [11] [12] These head-mounted phone ...
A handset is a component of a telephone that a user holds to the ear and mouth to receive audio through the receiver and speak to the remote party using the built-in transmitter. In earlier telephones, the transmitter was mounted directly on the telephone itself, which was attached to a wall at a convenient height or placed on a desk or table.
Later receivers in commercial wireless systems used a Morse siphon recorder, [22] which consisted of an ink pen mounted on a needle swung by an electromagnet (a galvanometer) which drew a line on a moving paper tape. Each string of damped waves constituting a Morse "dot" or "dash" caused the needle to swing over, creating a displacement of the ...
Wireless Set No. 33; Wireless Set No. 37 – Short range lightweight transmitter/receiver for use by paratroops. Some components used in S-Phone. Wireless Set No. 38 – Manpack radio set, also produced as an AFV version for use in armoured vehicles to allow direct communication with infantry. Wireless Set No. 38 Mk. III – Late WWII infantry ...
An old rotary dial telephone. AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone, colloquially referred to as a phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically ...
Head-mounted display. A head-mounted display ( HMD) is a display device, worn on the head or as part of a helmet (see helmet-mounted display for aviation applications), that has a small display optic in front of one ( monocular HMD) or each eye ( binocular HMD). HMDs have many uses including gaming, aviation, engineering, and medicine.
Base transceiver station. A base transceiver station ( BTS) or a baseband unit[ 1] (BBU) is a piece of equipment that facilitates wireless communication between user equipment (UE) and a network. UEs are devices like mobile phones (handsets), WLL phones, computers with wireless Internet connectivity, or antennas mounted on buildings or ...
30 mm M230 chain gun turret on a Boeing AH-64 Apache being aimed with a helmet-mounted sight. A helmet-mounted display ( HMD) is a headworn device that uses displays and optics to project imagery and/or symbology to the eyes. [ 1][ 2][ 3] It provides visual information to the user where head protection is required – most notably in military ...
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