#engineering dictionary

• Refining — An industrial technological process or set of physico-chemical operations performed to eliminate impurities from a raw metal, alloy, or molten glass; refining. In steelmaking, it specifically designates the conversion of pig iron into steel by reducing carbon, sulfur, and phosphorus.
• Refined — Subjected to an industrial or chemical purification process that eliminated impurities, residual elements, or trapped gas bubbles; refined, purified. In the textile industry, it describes a yarn or fiber that has been thinned and structurally homogenized.
• Attachment — The act of hooking or the state of being hooked; a device, structural system, or mechanical attachment point specially designed to suspend, secure, or anchor a component, cable, or utility equipment. In technical or regional language, the term describes the physical method of coupling or the structural connection between two moving or fixed elements.
• Alonjar — A mechanical device, auxiliary tool, or extension piece specially designed to extend the reach, useful length, or structural capacity of an instrument, clamping element, or industrial machinery. In machining or metal fabrication workshops, this element serves as a structural adapter allowing components to be secured and guided in narrow or hard-to-reach areas.
• Amplidyne — A special direct current electrical generator with armature reaction, utilized as an electromagnetic power amplifier in automatic regulation and electrical drive systems. This device uses the magnetic flux of the short-circuit armature current to achieve an extremely high amplification factor, allowing the control of large output powers using very small electrical command signals.
• Stereo receiver — A complex high-fidelity electronic apparatus that structurally combines a radio receiver (tuner) and an audio power amplifier within a single chassis. This device allows selecting, receiving, and decoding radio stations broadcast over ultra-short or medium waves, while simultaneously ensuring signal amplification and its efficient distribution to a modular speaker system.
• Asdic — An acoustic underwater detection apparatus used on naval vessels for the structural localization of submarines, wrecks, or other submerged objects, based on the emission and reception of ultrasonic waves; a precursor system to modern sonar. It also represents a historical acronym derived from the British research committee that developed it during World War I.
• Self-erecting — A device, mechanism, or industrial vehicle capable of raising, erecting, or mounting its own structure or heavy components using its own hydraulic systems and power without the assistance of an external crane. It is predominantly used in construction to describe specialized self-erecting tower cranes or high-precision mobile hydraulic platforms.
• Autotransformer — A special type of electrical transformer possessing a single winding on a common magnetic core, structurally serving as both primary and secondary windings through intermediate taps. This electrotechnical device is used for step-by-step or fixed variation of alternating voltage, offering high efficiency, small dimensions, and material savings compared to classic transformers with two galvanically isolated windings.