Inter tabulam et canona regulae sunt interpositae ad eundem modum foratae et oleo subactae, ut faciliter inpellantur et rursus introrsus reducantur, quae obturant ea foramina plinthidesque appellantur.
Between the pinax above and the canon below, bars are fixed with openings corresponding to those of the canon and the pinax. The bars are well oiled so that they easily pass backwards and forwards, closing and opening the holes in the channels. The bars are called plinthides.
final_alignments\Vitruvius_Architecture_Book_10.json