Restoration of the Historic
& G.G. Hook Organ

page 4

Anatomy of an Organ

Reinstallation of major parts of the organ began in earnest in early December with the pedal-board and the components connecting it to the pipes of the 16' Open Diapason stop that are at the very back of the organ case. Installation of this entire sequence of parts provides an opportunity to see just how a tracker action works.  In order to follow the action in its working order, begin with photo number 1 at the bottom of this page and follow the action up the page.




Photo number 6:  When the pallett is opened, the wind passes through a hole in the top of the windchest, into the extender box under each of these pipes.  The wind then travels into and through the pipe making it sound its note.  The new boxes simply allow the pipes to be set back closer to the wall, to provide more space for people to work inside the tight confines of the organ.



Photo number 5:  In this photo, the front has been removed from the wind chest, revealing the pallett and the metal spring which keeps it closed until the tracker below pulls it open to play the pipe above.



Photo number 4:  The roller board may be the most ingenious component of the organ.  It is not possible for every pipe in the organ to be directly in line with the key that plays it.  So, there is a roller for each pipe.  The trackers running from key to square rail to roller connect to a peg on the roller that is in line with the key.  Another peg on the same roller is lined up under the pipe that is to be played.  A tracker from that peg is attached to a wire that runs to the pallett that covers the opening to the pipe inside the wind chest.




Photo number 3:  At the square rail (lower right hand corner of the photo), the horizontal trackers pull a hinged lever that, in turn, pulls a vertical tracker.  This vertical tracker is attached to the roller board.


Photo number 2:  The trackers for the pedal stops, one tracker per note, extend along the floor from the back of the pedal board to a square rail near the back of the case.  These trackers are so long that two pieces must be spliced together to span the distance.  (Scroll up to photo number 3, etc.)


Photo number 1:  The mechanical action of the organ begins at the keyboards.  In December, the pedal-board was reinstalled.  Previously, the floor beneath it had been cut out in order to set the pedal-board back at its original depth. It now sits, once again, on the original floor of the church.  The interior of the case has been cleaned and the floor painted.  This will help with the long-term maintenance of the instrument and also makes it easier to see the action.  A note in the pedal division of the organ is played when the organist depresses one of the keys.  This act pulls a tracker, one of the thin strips of wood seen extending from behind the pedal-board towards the pedal pipes which are at the very back of the organ.  (Scroll up to photo number 2.)

Restoration of the Organ
page 3     page 5

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