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3In each channel are fixed stops, that are connected with iron finger-boards; on pressing down which, the communication between the chest and the channels is opened. Along the channels is a range of holes corresponding with others on an upper table, called πίναξ in Greek. Between this table and the canon, rules are interposed, with corresponding holes well oiled, so that they may be easily pushed and return; they are called pleuritides, and are for the purpose of stopping and opening the holes along the channels, which they do by passing backwards and forwards.
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