High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Wood's glass was developed by Robert Williams Wood (1868–1955) as a light filter used in communications during World War I. His "invisible radiation" technique worked both in infrared daylight communication and ultraviolet night communications. His glass filter removed the visible components of a light beam, leaving only the 'invisible radiation' as a signal beam. Wood's glass is commonly used to form the envelope for fluorescent and incandescent ultraviolet bulbs ("black lights").

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