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Envelope. Front of an envelope mailed in the U.S. in 1906, with a postage stamp and address. Back of the above envelope, showing an additional receiving post office postmark. An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card.
Stamped envelope. A 2 centavos stamped envelope with embossed Columbus indicium and 3c adhesive postage stamp from Cuba to Norway ca. 1904. A stamped envelope or postal stationery envelope (PSE) is an envelope with a printed or embossed indicium indicating the prepayment of postage. It is a form of postal stationery.
Envelope (waves) In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope.
Envelope (mathematics) Construction of the envelope of a family of curves. In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency together form the whole envelope. Classically, a point on the envelope can be thought of as the intersection of two ...
Pages in category "Envelopes" The following 23 pages are in this category, out of 23 total. This list may not reflect recent changes. ...
A piece of postal stationery is a stationery item, such as a stamped envelope, letter sheet, postal card, lettercard, aerogram or wrapper, with an imprinted stamp or inscription indicating that a specific rate of postage or related service has been prepaid. [1][2] It does not, however, include any postcard without a pre-printed stamp, [3] and ...
Envelope (motion), a solid representing all positions that an object may occupy during its normal range of motion. Envelope (music), the variation of a sound over time, as is used in sound synthesis. Envelope (radar), the volume of space where a radar system is required to reliably detect an object. Envelope (waves), a curve outlining the peak ...
Discussion. The building envelope or enclosure is all of the elements of the outer shell that maintain a dry, heated, or cooled indoor environment and facilitate its climate control. Building envelope design is a specialized area of architectural and engineering practice that draws from all areas of building science and indoor climate control.
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