Things really fly at times...we have the windchest righted and on its frame. We are no ready to look at the top of the unit. It is so pleasing ( and a HUGE relief) to see that this area is in nearly perfect condition also.
This is the heart of the instrument. When the pallet underneath opens up it lets air into the channel. If the slider (black thing) hole lines up with the channel hole, wind flows and the pipe speaks. If it doesn't, well, it doesn't.
Channel: In a tracker windchest, the area immediately above the pallet. All the pipes that could possibly sound on that note are arranged so as to sit on channel holes on one channel.
Channel Hole: The hole beneath the slider hole. If the pallet is open air tries to move through the channel hole.
Slider: A piece of wood or phenolic with holes drilled at specific intervals. All the pipes of a rank are arranged on one particular slider.
Split slider: A slider that has two sections, so that one may be moved without disturbing the other.
Slider Hole: A hole drilled in a slider. It is placed in such a way so that all the holes on a slider will either match their specific channel hole or block it.
Speak: When referring to an organ pipe, to speak is to make a sound (hopefully pleasant)
In the second picture above, I have moved a slider aside to show the channel holes underneath it. The slider holes can either match the channel holes and allow the pipes to speak or block the holes, and thus the air, to prevent the pipes from speaking.
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