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A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
Z — Fritz Zwicky, Catalogue of galaxies and of clusters of galaxies; ZC — Robertson's Zodiacal Catalogue (James Robertson's catalogue of 3539 zodiacal stars brighter than 9th magnitude) Zij — Islamic astronomical books that tabulates parameters used for astronomical calculations of the positions of the Sun, Moon, stars, and planets
Original file (772 × 1,372 pixels, file size: 22.81 MB, MIME type: application/pdf, 224 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Catalogue of Oriental Manuscripts, Xylographs etc. in Danish Collections Catalogue of Political and Personal Satires Preserved in the Department of Prints and Drawings in the British Museum Catalogue of Works in Refutation of Methodism
The Aresti Catalog is the Fédération Aéronautique Internationale (FAI) standards document enumerating the aerobatic manoeuvers permitted in aerobatic competition.Designed by Spanish aviator Colonel José Luis Aresti Aguirre (1919–2003), each figure in the catalog is represented by lines, arrows, geometric shapes and numbers representing the precise form of a manoeuver to be flown.
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The following is a list of NGC objects, that is objects listed in the New General Catalogue (NGC). It is one of the largest comprehensive astronomical catalogues for deep sky objects such as star clusters, nebulae, and galaxies. List of NGC objects (1–1000) List of NGC objects (1001–2000) List of NGC objects (2001–3000)
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