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5 2 DICTIONARY OF ORGAN STOPS. Fig. C—Roller-Valve Diaphone. used for this purpose in bellows work, where a A different type of Diaphone is repre- sented by Fig. C. Its tone is said to par- take of the nature of a smooth Diapason or Flute. A model was exhibited by Mr. Hope- Jones at a lecture in 1895. Wind enters at the foot a, charges the chamber c, and acts upon the back of the motor M, in such a manner that this latter is collapsed. In collapsing it moves (through the medium of the thong or flat chain b) the roller valve v, thus allowing the wind in the chamber c to escape through e into the resonator or pipe p. Wind, passing through the channel l, acts upon the inside of the motor m in such a manner that the pressure on the inside and the out- side of the motor is balanced, and the spring s is at liberty to close the roller valve v again. The cyclic process is re- peated. The particular function of the roller valve in organ work is to admit wind gradu- ally. It is sometimes sudden flush of wind
DICTIONARY OF ORGAN STOPS. S3 is not desired. It will be seen that in this type of Diaphone the valvular movement is less sudden than that of the preceding patterns. The smoother the action of the valve, the smoother the tone quality generated. If, on the contrary, the valve beat forcibly on its seat, the resultant tone will be rough and coarse. This Roller-Valve Diaphone is here described mainly on account of its theoretical interest ; it is scarcely a form adapted to practical use. In the above Diaphones the quality and power of the tone can be controlled within limits by the shape and sue of the resonators, the tension of the springs, etc. By the substitution of cylindrical resonators, Clarinet tones have been obtained. Their satisfactory tonal effect is very dependent on the suppleness of the valve. A somewhat serious objection to which all these forms of Diaphone are open is their lack of durability. It will be evident that the wear and tear of motors vibrating, in the case of high notes especially, at the requisite rapidity, must be very great. On the other hand, no single note is ever in continuous motion for a protracted period of time, and were some mechanism to be invented for computing the number of minutes in a year that a Diaphone pipe was in action, the number indicated would probably be found to be small It is but fair to observe that the Diaphones at Worcester and Edinburgh, referred to above, although probably somewhat decayed, are still in excellent working order. Moreover, it is a matter of no very great difficulty to replace worn-out motors. In 1897 Mr. Hope-Jones patented an improved variety of Diaphone, known as the Diaphonic Horn, or sometimes as the "valvular reed." In it the motor bellows is dispensed with, the vibrating pallet or disc being carried on the free end of a spring. It is thus a variety of beating reed. The construction of this form of Diaphone will be explained by reference to Fig. D. The spring s is made of aluminium, a pliable metal readily admitting the correct adjustment of the disc in relation to the block against which it beats. Whereas the Tremulant Diaphones are tuned by the resonator or pipe, the valvular reed is properly Fig. D—" Valvular Reed' or Diaphonic Horn.
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DICTIONARY OF ORGAN STOPS JJ.WEDGWO
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Cornell University Library The orig
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THIRD EDITION. TO T. TERTIUS NOBLE,
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A WORK FOREWORD. of this kind will
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PREFACE. V frame a few constructive
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PREFACE. Vll from the facts that a
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PREFACE TO THE SECOND EDITION. THE
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PREFACE TO THE SECOND EDITION. XI c
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XIV BIBLIOGRAPHY. 1833 he went to P
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XVI TABLE OF HARMONIC SERIES. TABLE
Page 25 and 26: DICTIONARY OF ORGAN STOPS. A. Acous
Page 27 and 28: DICTIONARY OF ORGAN STOPS. 3 artist
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Page 43 and 44: DICTIONARY OF ORGAN STOPS. 1 IV ran
Page 45 and 46: DICTIONARY OF ORGAN STOPS. 21 is ra
Page 47 and 48: DICTIONARY OF ORGAN STOPS. 23 Clari
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Page 51 and 52: DICTIONARY OF ORGAN STOPS. 27 CLEAR
Page 53 and 54: DICTIONARY OF ORGAN STOPS. 2 9 Cont
Page 55 and 56: DICTIONARY OF ORGAN STOPS. 3 (2) In
Page 57 and 58: DICTIONARY OF ORGAN STOPS. 33 beaut
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Page 61 and 62: DICTIONARY OF ORGAN STOPS. 37 judgm
Page 63 and 64: DICTIONARY OF ORGAN STOPS. 39 (3) I
Page 65 and 66: DICTIONARY OF ORGAN STOPS. 41 seeme
Page 67 and 68: DICTIONARY OF ORGAN STOPS. 43 mouth
Page 69 and 70: DICTIONARY OF ORGAN STOPS. 45 domai
Page 71 and 72: DICTIONARY OF ORGAN STOPS. 47 legit
Page 73 and 74: DICTIONARY OF ORGAN STOPS. 49 Dia.p
Page 75: above stops are all of the bivalvul
Page 79 and 80: DICTIONARY OF ORGAN STOPS. 55 ^SSSN
Page 81 and 82: DICTIONARY OF ORGAN STOPS. 57 made
Page 83 and 84: DICTIONARY OF ORGAN STOPS. 59 was n
Page 85 and 86: DOUBLE - TONGUEO REED —Double-ton
Page 87 and 88: DICTIONARY OF ORGAN STOPS. 63 Dulci
Page 89 and 90: DICTIONARY OF ORGAN STOPS. 65 Echo
Page 91 and 92: DICTIONARY OF ORGAN STOPa. 67 Examp
Page 93 and 94: DICTIONARY OF ORGAN STOPS. 69 Flaut
Page 95 and 96: DICTIONARY OF ORGAN STOPS. T Flauto
Page 97 and 98: DICTIONARY OF ORGAN STOPS. 73 Flote
Page 99 and 100: DICTIONARY OF ORGAN STOPS. 75 lips
Page 101 and 102: DICTIONARY OF ORGAN STOPS. 77 to am
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Page 105 and 106: DICTIONARY OF ORGAN STOPS. 8r high.
Page 107 and 108: DICTIONARY OF ORGAN STOPS. 83 Germa
Page 109 and 110: DICTIONARY OF ORGAN STOPS. 85 H, Ha
Page 111 and 112: DICTIONARY OF ORGAN STOPS. 87 Harmo
Page 113 and 114: DICTIONARY OF OKQAN STOPS. -89 stan
Page 115 and 116: DICTIONARY OF ORGAN STOPS. 91 Hohlf
Page 117 and 118: HORN GAMBA—See Fugara. DICTIONARY
Page 119 and 120: DICTIONARY OF ORGAN STOPS. 95 pecul
Page 121 and 122: RRUMMHORN—See Clarinet. DICTIONAR
Page 123 and 124: DICTIONARY OF ORGAN STOPS. 99 Litic
Page 125 and 126: DICTIONARY OF ORGAN STOPS. 1 01 Hou
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DICTIONARY OF ORGAN STOPS. 103 test
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DICTIONARY OF ORGAN STOPS. 105 word
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DICTIONARY OF ORGAN STOPS. 10J ad a
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DICTIONARY OF ORGAN STOPS. 109 Anot
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Oboe. DICTIONARY OF ORGAN STOPS. Il
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DICTIONARY OF ORGAN STOPS. 113 Orch
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DICTIONARY OF ORGAN STOP? 115 OfTen
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DICTIONARY OF ORGAN STOPS. 117 reso
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DICTIONARY OF ORGAN STOPS. Prinzipa
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DICTIONARY OF ORGAN STOPS. 121 The
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DICTIONARY OF ORGAN STOPS. 123 its
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DICTIONARY OF ORGAN STOPS. "5 R. Ra
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DICTIONARY OF ORGAN STOPS. 127 much
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DICTIONARY OF ORGAN STOPS. 129 or a
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DICTIONARY OF ORGAN STOPS. 13I orga
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DICTIONARY OF ORGAN STOPS. 133 Rega
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DICTIONARY OF ORGAN STOPS. 1 35 Mes
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DICTIONARY OF ORGAN STOPS. '37 chim
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Salicional .(rollered), with double
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DICTIONARY OF ORGAN STOPS. 141 empl
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DICTIONARY OF ORGAN STOPS. 1 43 Sha
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DICTIONARY OF ORGAN STOPS. 145 8 ft
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Subbass—See Bourdon. DICTIONARY O
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DICTIONARY OF ORGAN STOPS. 149 prop
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DICTIONARY OF ORGAN STOPS. 151 and
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154 Metal Tibia Minor
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156 DICTIONARY OF ORGAN STOPS. U P
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158 DICTIONARY OF ORGAN STOPS. of a
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i6o DICTIONARY OF ORGAN STOPS. Trom
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1 62 DICTIONARY OF ORGAN STOPS. Tro
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164 DICTIONARY OF ORGAN STOPS. util
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1 66 DICTIONARY OF ORGAN STOPS. 1 2
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1 68 DICTIONARY OF ORGAN STOPS. Tus
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170 DICTIONARY OF ORGAN STOPS. "Vio
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172 DICTIONARY OF ORGAN STOPS. due
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174 DICTIONARY OF ORGAN STOPS. Pari
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176 DICTIONARY OF ORGAN STOPS. them
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i 7 8 DICTIONARY OF ORGAN STOPS. me
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180 DICTIONARY OF ORGAN STOPS. rate
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182 DICTIONARY OF ORGAN STOPS. Vox
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1 84 DICTIONARY OF ORGAN STOPS. it
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1 86 DICTIONARY OF ORGAN STOPS. z\
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i88 PHONETIC PRONOUNCING VOCABULARY
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190 LIST OF SUBSCRIBERS. LIST OF SU
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192 LIST OF SUBSCRIBERS. Gordon & G
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194 LIST OF SUBSCRIBERS. Rollo, D.,
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THE SHEFFIELD DAILY TELEGRAPH. " Mr
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Works by the same Author. A HISTORY
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MUSICAL WORKS COMPOSED OR EDITED BY
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— MUSICAL WORKS BY FRANCIS BURGES
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The "JOHN HOLT" "PIONEER" PEDAL REE
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— — " Artis est Celare Artem" A
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ESTABLISHED 1869. TELEPHONE 673. Ab
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J. J. BINNS, BRAMLEY ORGAN WORKS, l
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ROBERT SPURDEN #rgan BSutltrer, RUT
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ESTABLISHED 1886. TUNINGS, &c, by Y
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Ssta.1blish.ecl 1888. High Class Ch
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