gr. denotes a grain.
P. stands for particula, a little part, and means so much as can be taken between the ends of two fingers.
P. æq. stands for partes æquales, or equal parts.
q. s. quantum sufficit, or as much as is sufficient.
q. p. quantum placit, or as much as you please.
s. a. secundem artem, or according to art.
METAL RULES OR DASHES.
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.