ained. For Circulars,
and in general, all such orders of Government as must be rapidly
distributed, an invention like this is of the utmost consequence, and it
is probable that eventually it will be universally employed. In time of
war it would prove of the greatest use for the general staff of the
Army, completely supplying the want of a field Printing-Office, and
especially as it admits of greater despatch and secresy. The Commanding
Officer might write his orders with his own hand, and in his presence a
number of impressions might be taken by a person who could neither write
nor read. In mercantile transactions, it is very generally employed
where a quick and accurate multiplication of Price Lists, Letters, and
Accounts, is of the utmost importance.

COPPER-PLATE PRINTING.

Copper, or Steel-plate Engravings, are Printed by a different process.
The Copper, or Steel-plate Press, is formed of two Rollers, one placed
over the other, with only a sufficient space between to allow a board to
pass, when a strong force is applied. The Plate is then laid on a small
fire adapted to the purpose, so as to heat it sufficiently to liquify
the Ink, and cause it to diffuse itself over every part of the
Engraving. It is then made perfectly clean, so as to leave no soil on
the paper, except from the parts indented. It is then laid on the board,
the Paper spread upon it, and a soft cloth being added, the Roller is
turned by a Cross Lever, when the Print, with all its varied tints, is
immediately produced.

ENGRAVINGS ON WOOD.

Engravings on Wood, are usually Printed with the Letter Press, for which
they are peculiarly adapted.

The next subject which claims attention is the

PREPARATION OF THE MANUSCRIPT.

When a Manuscript intended for the Press has been written hastily, has
many erasures and interlineations, or is otherwise to any extent
rendered partially, or perhaps in some cases wholly illegible, the
consequence will be, that if given into the hands of the Printer in that
state, the Printing will be retarded, the expense of Printing increased,
and much additional trouble occasioned to the Author, in correcting
those errors, (should he discover them,) which a clearly written
Manuscript would have entirely prevented. In such cases it would be
decidedly preferable, indeed it has been found a saving both in time and
expense, to have the whole fairly copied. In so doing there would
besides be this additional advantage,--t