A comprehensive dictionary of organ stops - Allen Organ Studio of ...
A comprehensive dictionary of organ stops - Allen Organ Studio of ... A comprehensive dictionary of organ stops - Allen Organ Studio of ...
5° DICTIONARY OF ORGAN STOPS. inserted in the organ built by the same firm for the McEwan Hall, Edinburgh. The 32 ft., stop speaks through a semi-circular opening in the roof. Both mark a decided advance on the earlier examples. The Fig. A—Bivalvular Diaphone. J-&.
above stops are all of the bivalvular type illustrated in Fig. A. m is a motor, to the tail-piece of which is attached a rod bearing the compound and spring valves v, v 1 , working against the springs s, s 1 . On the admission of wind (under pressure) to the box a, the motor m is caused to collapse, and thereby to open the valves v, v 1 . Wind then rushes into the chamber b, and, entering the in- terior of motor m through the passage c, equalizes the pressure on the motor. The action of the springs now serves to close the valves v, v ', and to open out the motor m, whereupon the pro- cess is repeated. DICTIONARY OF ORGAN STOPS. S» Fig B illustrates a simpler, in fact the original, form of Tremulant Dia- phone. No examples have actually been used in organs in this country, but this particular form of Diaphone is very successfully used by Voit of Durlach, Germany, as the sole pedal stop (Diaphonic Bassoon) in his small compact organs. The raison d'etre of this somewhat singular tonal dis- position is to be found in the high efficiency of this stop on a low wind pressure. A specimen, speaking on a pressure of ioo mm. (4 in.) occurs at Luxembourg Church (1902, de- signed in 1900). The action of the Diaphone shown in Fig. B will be explained by reference to the descrip- tion of Fig. A. The satisfactory working, and the tone quality, depend greatly on the adjustment of the spring s. This spring might be at- tached to the valve, similarly to one of the springs shown in Fig. A. Fig. B. Diaphonic Violone or Bassoon.
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5°<br />
DICTIONARY OF ORGAN STOPS.<br />
inserted in the <strong>organ</strong> built by the same firm for the McEwan Hall,<br />
Edinburgh. The 32 ft., stop speaks through a semi-circular opening in<br />
the ro<strong>of</strong>. Both mark a decided advance on the earlier examples. The<br />
Fig. A—Bivalvular Diaphone. J-&.