This machine, it will be seen, requires accuracy in
construction, as do also the types that are used with it, and
this has been reduced to an exact system. The types prepared by
casting in the usual manner. are set in line, clamped in a
slide, and the lines of notches or grooves upon the edges are
plowed or planed in them : the accuracy of the tools employed in
these operations determines the accuracy and perfect working of
the machine. The grooves have been cast in the characters in
several cases. By the use of this machine, types made in the
highest perfection of type founding are used, which is not the
case in the type of stereotyping or line casting, because the
differences in the form or character of different parts of the
same font of letters demand for the best perfection differences
of temperature and of metal, which are regulated by the skill
and care of the workmen in making the type. In handling the type
by this machine, contact of the face of the letter with any of
the parts of the machine is avoi