. The American educator; completely remodelled and rewritten from original text of the New practical reference library, with new plans and additional material. keyboard, by means of which this com-munication may be opened or closed at pleas-ure. The air is forced into the wind chestbj means of bellows, which are operated bywater power, by electricity or by hand. Tothe upper part of each wind chest is attacheda sound board, a contrivance divided into asmany grooves as there are keys, for the pas-sage of wind. Air is admitted into thesegrooves by means of valves, or pallets, con-nected with the
. The American educator; completely remodelled and rewritten from original text of the New practical reference library, with new plans and additional material. keyboard, by means of which this com-munication may be opened or closed at pleas-ure. The air is forced into the wind chestbj means of bellows, which are operated bywater power, by electricity or by hand. Tothe upper part of each wind chest is attacheda sound board, a contrivance divided into asmany grooves as there are keys, for the pas-sage of wind. Air is admitted into thesegrooves by means of valves, or pallets, con-nected with the keys; the transmission of air,,and consequently the quality of the tone pro-duced, is regulated by the register, or series of pipes above each slide is calleda stop. The principal stops of an organ arethe open, stopped and double diapasons; theprincipal, didciatw, melodia, salicional, flute,trumpet, clarion, bassoon, oboe and voxhumana. An organ may have several wind chests,filled by the same bellows, and several key-boards, each keyboard and wind chest rep-resenting a distinct organ and connected witha separate group of pipes. In the largest. ORIFLAMME 2678 ORION instruments these organs are five in number,namely, the great organ, the choir organ, theswell organ, the solo organ and the pedalorgan. The keys for the hand are termedmanuals, the parts operated by the feet,pedals. The most common compass of themanuals is from CC to F, four octaves anda half; that of the pedals from CCC to E orF, two and a quarter to two and a half oc-taves. There are two kinds of organ pipes—flute pipes, or mouth pipes, and reed are several kinds of each, the charac-ter and quality of their sound dependingmainly on the material employed in theirmanufacture (wood or metal), their shapeand their dimensions. In 1863 a contrivance was patented fortransferring some of the work from mechan-ism to electro-mechanism. An organ built onthis principle is termed an electric organ. Itfac
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Keywords: ., bookauthorhughesja, bookcentury1900, bookdecade1910, bookyear1919
