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Grooves in the layers of the Coppel 8ft upperboard

This is the Coppel 8ft (stopped wood) upperboard and a joining board to the vertical board for the bass pipes.  In the bass the position of the pipes cannot be accommodated to the spacing of the channels, so they have to be moved further and further away, and the bottom pipes are placed horizontally, with grooving from the slider hole to the pipe hole.  The channels are organised chromatically, in alignment with the keys, and the grooving is relatively simple, compared to some organs in this style .