Mitreing guard

A small machine used for mitreing brass rule. It is made of cast-iron, with the exception of the front, which is of hardened steel. When a job requires a brass rule border, the rule is cut to suit the four sides of the page; but instead of printing them thus,

the rule is fixed in the mitreing guard, by means of a screw, and the ends filed till they join thus:—

A neater appearance is thus obtained, and greater credit is reflected on the compositor.