The Century dictionary and cyclopedia; a work of universal reference in all departments of knowledge, with a new atlas of the world .. . size of their vihratiletongues, and its quality on their proiKutinns and on thecharacter of the resonating cavities with which they areconnected. Each set of vibrators constitutes a «(</;), theuse of which is controlled by a stop knob. The possiblevariety of qualities Is ratherlimited. 1 he treadles operatefeeders, which are conjiecteil with a general bellows, sothat the current of air may be malntaJDcd at a constant 5028 tension; hut in the harmonium the
The Century dictionary and cyclopedia; a work of universal reference in all departments of knowledge, with a new atlas of the world .. . size of their vihratiletongues, and its quality on their proiKutinns and on thecharacter of the resonating cavities with which they areconnected. Each set of vibrators constitutes a «(</;), theuse of which is controlled by a stop knob. The possiblevariety of qualities Is ratherlimited. 1 he treadles operatefeeders, which are conjiecteil with a general bellows, sothat the current of air may be malntaJDcd at a constant 5028 tension; hut in the harmonium the waste-valve of thebellows may be closed by drawing a stop knobcalled the ex-premon-stop, so that the force of the tones may be directlyvaried by the rapidity of the treadling. In the Americanorgan the force of the t^mes is varied by a lever, operatedby the players knee, which ojiens or closes a shutter inthe box inclosing the vibrators. The harmonium some-times has a mechanism called the percussion, providing alittle hammer to strike the tongueof each reed as its digi-tal is depressed, thus setting it into vibration very prompt-. a, case; 5. stop-rail and stops: , reed-board, which supports the reeds inslots formed thereni (see cut under refd^); i, *. swells (see cutbelow): /, reed-valve ; w(. valve-spring which closes the valve afterthe latter is opened by push-pin shown in the cut lielow. There isone of these for each key, admitting wind to one or morereeds of a set or such sets of reeds as are allowed to act by the stopspulled out, and of a particular tone corresponding with the key;n, stop-anu ; o, key-frame. ly. A tremulant is often introduced, consisting of a re-volving fan, by which the
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Keywords: ., bookcentury1800, booksubjectatlases, booksubjectenglishlanguage
