Metal Rules or dashes, [⸺] like quadrates, are commonly cast from one em
to three ems in length. When cast to line and join accurately, they may
be used instead of brass rule.
METAL RULES OR DASHES.
The American Printer: A Manual of Typography Containing practical directions for managing all departments of a printing office, as well as complete instructions for apprentices; with several useful tables, numerous schemes for imposing forms in every variety, hints to authors, etc. · 第 96 / 417 题