‹‹‹ Vitr. 10.8.2 | Table of Contents | Vitr. 10.8.4 ›››
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.
3Each of the channels has a cock in it, furnished with an iron handle. These handles, when turned, open ventholes from the windchest into the channels. From the channels to the canon there are vertical openings corresponding to ventholes in a board above, which board is termed πἱναξ in Greek. Between this board and the canon are inserted sliders, pierced with holes to correspond, and rubbed with oil so that they can be easily moved and slid back into place again. They close the above-mentioned openings, and are called the plinths. Their going and coming now closes and now opens the holes.