optical house
121Guglielmo Marconi — Born 25 April 1874(1874 04 25) Palazzo Marescalchi, Bologna …
122Low-power broadcasting — Contents 1 United States 1.1 FM radio 1.1.1 LPFM classes 1.1.2 …
123Smoke detector — A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a… …
124History of Mill Hill — Mill Hill is a place in the London Borough of Barnet in London, England.IntroductionMill Hill was until 1965 a district of the ancient civil parish and manor of Hendon. It became an independent ecclesiastical parish in 1836 measuring 3,570 acres… …
125Movietone sound system — The Movietone sound system is a sound on film method of recording sound for motion pictures that guarantees synchronization between sound and picture. It achieves this by recording the sound as a variable density optical track on the same strip… …
126Fiber Bragg grating — A fiber Bragg grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others. This is achieved by adding a periodic variation to the… …
127Astronomy in medieval Islam — An 18th century Persian Astrolabe, kept at The Whipple Museum of the History of Science in Cambridge, England. Islamic astronomy or Arabic astronomy comprises the astronomical developments made in the Islamic world, particularly during the… …
128Crew Return Vehicle — ISS Crew Return Vehicle – CRV (X 38 Prototype) Operator NASA The Crew Return Vehicle (CRV), sometimes referred to as the Assured Crew Return Vehicle (ACRV), is the proposed lifeboat or escape module for the International Spa …
