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A portative organ (from the Latin verb portare, "to carry"), also known during Italian Trecento as the organetto, is a small pipe organ that consists of one rank of flue pipes, sometimes arranged in two rows, to be played while strapped to the performer at a right angle.
A well-known instance of an early positive or portable organ of the 4th century occurs on the obelisk erected to the memory of Theodosius I on his death in AD 395. Among the illuminated manuscripts of the British Museum there are many miniatures representing interesting varieties of the portable organ of the Middle Ages, including Add. MS. 29902 (fol. 6), Add. MS. 27695b (fol. 13), and Cotton ...
Historically the ancestor of pump organs began as the types of pipe organs (positive, portative) using the resonance-pipes powered by the bellows (i.e. pumped pipe organs). In the 17th century on the small reed-pipe organs called regal , these reed-pipes were replaced by the beating- reeds , and its form is closer to the later rocking melodeon ...
A portative organ or a positive organ (which are also, but imprecisely, known as box, trunk, and cabinet organs) can be used in a residential setting, but the notion of a residence organ strictly embodies a permanence of place that is belied by the notion of portability embodied by the portatives and positives.
The organ which provides music and accompanies the choir may be located on the screen, or may be in the gallery above the choir, or in a transept. Some churches have an organ loft at the west end of the church. These are usually a later addition to medieval churches; large examples had portative organs, often several. [37]
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
Our country's pumpkin-carving history began with a spooky tale. The post The History of Jack-o-Lanterns and How They Became a Halloween Tradition appeared first on Reader's Digest.
In chemistry, chirality usually refers to molecules. Two mirror images of a chiral molecule are called enantiomers or optical isomers. Pairs of enantiomers are often designated as "right-", "left-handed" or, if they have no bias, "achiral". As polarized light passes through a chiral molecule, the plane of polarization, when viewed along the ...