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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.
The Herschel 400 catalogue is a subset of William Herschel's original Catalogue of Nebulae and Clusters of Stars, selected by Brenda F. Guzman (Branchett), Lydel Guzman, Paul Jones, James Morris, Peggy Taylor and Sara Saey of the Ancient City Astronomy Club in St. Augustine, Florida, United States c. 1980.
Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...
Front cover of Eaton's Spring and Summer Catalogue 1942. The Eaton's catalogue was a mail-order catalogue published by Eaton's from 1884 to 1976. It was "one of the first to be distributed by a Canadian retail store". [1] The first version of the catalogue was a 32-page booklet handed out at the Industrial Exhibition (now the Canadian National ...
The Creature Catalogue is in the format of a 96-page perfect-bound book, which TSR had been adopting more frequently at the time. [2] Cover art is by Keith Parkinson . An updated version, titled Creature Catalog , was released in March 1993 as accessory "DMR2", part of the "Challenger Series" of Basic D&D accessories that followed the 1991 ...
Anglo-American Cataloguing Rules (AACR) were an international library cataloging standard.First published in 1967 and edited by C. Sumner Spalding, [1] a second edition (AACR2) edited by Michael Gorman and Paul W. Winkler was issued in 1978, with subsequent revisions (AACR2R) appearing in 1988 and 1998; all updates ceased in 2005.
Air conditioning, often abbreviated as A/C (US) or air con (UK), [1] is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and in some cases also controlling the humidity of internal air.
The Next Whole Earth Catalog (ISBN 0-394-70776-1) in 1980 was well received, and an updated second edition followed in 1981. The 1980s also saw two editions of the Whole Earth Software Catalog, a compendium for which Doubleday had bid $1.4 million for the trade paperback rights. [7]