The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust. The ratio of the mass-flow of air bypassing the engine core to the mass-flow of air passing through the core is referred to as the bypass ratio. The engine produces thrust through a combination of these two portions working together; engines that use more jet thrust relative to fan thrust are known as low-bypass turbofans, conversely those that have considerably more fan thrust than jet thrust are known as high...

The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust. The ratio of the mass-flow of air bypassing the engine core to the mass-flow of air passing through the core is referred to as the bypass ratio. The engine produces thrust through a combination of these two portions working together; engines that use more jet thrust relative to fan thrust are known as low-bypass turbofans, conversely those that have considerably more fan thrust than jet thrust are known as high...

The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust. The ratio of the mass-flow of air bypassing the engine core to the mass-flow of air passing through the core is referred to as the bypass ratio. The engine produces thrust through a combination of these two portions working together; engines that use more jet thrust relative to fan thrust are known as low-bypass turbofans, conversely those that have considerably more fan thrust than jet thrust are known as high...

A Polyphon is a disc-playing music box, a mechanical device first manufactured by the Polyphon Musikwerke, located in Leipzig, Germany. Invented in 1870, full-scale production started around 1897 and continued into the early 1900s. Polyphons were exported all over the world and music was supplied for the English, French and German markets, as well as further afield, with pieces cataloged for the Russian, Polish and Balkan regions. Polyphon is also a record label as registered by German Polyphon Musikwerke AG in 1908. Polyphon traded under the Polydor label since 1913 with their trademarks Polyphon Musik and Polyphon Record. Polyphon Musikwerke The German company was founded in 1887 in Wahren, Leipzig, as Firma Brachhausen & Riesener, by Gustav Adolf Brachhausen and Ernst Paul Riessner, for manufacturing their 1870 invention mechanical disc-playing music box Polyphon. The company was renamed to Polyphon-Musikwerke AG in 1895. In 1908 Hugo Wünsch was appointed director, but became head of the new subsidiary Deutsche Grammophon AG in 1918. On April 24, 1917, Polyphon-Musikwerke AG acquired the Deutsche...

Catholic devotions are particular customs, rituals, and practices of worship of God or honour of the saints which are in addition to the liturgy of the Catholic Church. The United States Conference of Catholic Bishops describes devotions as "expressions of love and fidelity that arise from the intersection of one's own faith, culture and the Gospel of Jesus Christ". Devotions are not considered part of liturgical worship, even if they are performed in a church or led by a priest, but rather they are paraliturgical. The Congregation for Divine Worship at the Vatican publishes a Directory on Popular Piety and the Liturgy.Catholic devotions have various forms, ranging from formalized, multi-day prayers such as novenas to activities, such as processions or the Eucharistic adoration, the wearing of scapulars, the veneration of the saints, the Canonical coronations of sacred Marian or Christological images and even horticultural practices such as maintaining a Mary garden.Common examples of Catholic devotions are the Way of the Cross, the Rosary, the Angelus and various litanies, devotions to the Blessed Sacrament, the Sacred Heart, the Immaculate Heart of Mary...