A comprehensive dictionary of organ stops - Allen Organ Studio of ...

48
DICTIONARY OF ORGAN STOPS.
circumference of the pipe. Mr. T. C. Lewis* furnishes the following
measurements as those of his ideal standard Diapason pipe : Mid. G
3j^- in. diameter; Mouth, ^ circumference, cut up "§ and -g^" (i.e.>
sf in.) ; Bore "•§ and ^t " (i.e. ^ in.) ; Wind pressure, 3^ in. ; Pitch, 267I
vibrations at 6o° Fahr. The pipes, from tenor C upwards, of a Diapason
of ordinary substance, weigh about 80 or 90 lbs. ; those of a German
Diapason (a stop which is almost invariably made of tin), about 66 lbs.
whereas those of the modern leathered Diapason, made of the heavy
"special" metal, which is now being used by several builders when great
depth and volume of tone is desired, weigh actually 130-150 lbs. It is
not possible to obtain the true massive Diapason roll from pipes of any
less weight. If an ordinary pipe be gripped round the middle whilst
speaking, a strong tremor will be perceptible to the hand. A great
deal of energy is being wasted by transmission through the "walls" or
body of the pipe. It is only by making the pipes sufficiently stout to
withstand this vibration that the requisite plenitude of tone can be secured
in large Diapasons. Diapasons of this type are, of course, costly ; but their
effect is fully commensurate with their cost. ,
It is not sufficiently realised
that the increased wind pressures, which have come into use during the
past few years, demand corresponding increase in the thickness of pipes.
Diapason Phonon-8 ft. ; also 16 ft.
The name originally applied by Mr. Hope-Jones to the leathered
Diapason (see Diapason, sections 6 and 7). The name might well be
retained for this stop when in the Swell organ, constituting, as it does,
such a wide departure from the ordinary Swell Diapason. The Diapason
Phonon on the Great organ at Colston Hall, Bristol (Norman & Beard),
is a large Diapason treated with resonators, in the form of sleeves at
the top of the pipes. The stop speaks on a 10 in. wind. In U.S.A.,
St. Luke, Montclair, N.J., by Hope-Jones & Harrison ; Park Church,
Elmira, N.Y. ; First Presbyterian Church, Montclair, N.J. ; Lutheran
Church, Lebanon, Pa. ; Roman Catholic Church, Providence, R.I., by
Austin Organ Co., and Hope-Jones. For illustration, see Diapason.
Diaocton— (Gr.) lia = through. 6kto> = eight.
(1) The name given to the octave coupler by Holditch, who appears
independently to have invented it, though long, of course, after its first
employment in Italy, and subsequent to its introduction at St. James,
Bristol, (Smith, 1819). (2) A 16 ft. pedal stop (Washington Temple,
U.S.A.).
= Major Bass.
Diapason, Stopped—See Gedeck r.
Diapente— -(Gr.) Sia. = through, irivre = five. = Quint.
* "A Protest," etc., p. 5.
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