Opus 11 - 1972
Mount Calvary Evangelical
The tracker action pipe organ installed
in Mount Calvary Church contains 18 stops and 25 ranks of pipes. There
are approximately 1200 pipes in the organ.
The organ has been built along lines similar
to those of northern Europe and the contemporary tonal design philosophy
of the "Orgelbewegung" or organ reform movement, which stresses tracker
action, low wind pressures, casework surrounding the pipes, and an integral,
self-contained approach to the design of the instrument.
The casework of the instrument is oak,
stained to match the woodwork of the church interior. Walnut has been used
for the wood around the keyboards, and the granadilla and other woods have
been used for the keys and drawknobs.
The organ is a 2 manual and pedal instrument,
with each division separate and distinct from the others. At the lower
center of the casework, just above the keyboards, are the expression shades
of the Brustwerk division which is played from the top keyboard. Just behind
the shades are the visible pipes of the 8' Regal. Above the Brustwerk division
are the visible pipes of the Spitzprestant 8' of the Pedal division, and
the Prestant 8' pipes of the Hauptwerk division. The Hauptwerk division
is playable from the lower keyboard.
At the left of the organ, in the section
of the room behind the grillwork are the blower for the organ, the rectifier,
and the larger pipes of the Pedal Subbass 16' which are made of wood, and
the Pedal Fagott 16' which are made of zinc.
The pipes of the organ are made from tin,
lead, zinc, select sugar pine, and fir. The pipes are played by air from
wind chests containing pallet valves and mechanical linkages to the keyboards
from the pallets. An electric stop action and a free combination action
are provided for changing the stops.
The organ was designed by Charles Hendrickson,
with assistance from Paul Manz. The organ was built by Mr. Hendrickson
with the assistance of Robert Sperling who voiced the pipes, Barry Lund,
shop foreman, and David Engen, Peter Mokkonen, Kenneth Stromberg, David
Lofgren, and Richard Traver.