Place the sheet so prepared on a pad made of several sheets of blotting paper, smeared with blue analine ink, or a mixture of lamp-black and oil.
Fix the corners with tacks or drawing pins, and draw your copies by simply placing the blank sheets over the pricked one, and press them down. The words, figures or designs will be reproduced in dotted lines if the holes have been well pricked. In this way a good number of copies can be drawn.
The Drawing Room Mirror.
On one of the faces of a pane of glass smear some lamp-black mixed with oil. If you place this glass, thus prepared, vertically on an engraving representing flowers, fruits, birds, etc., you will obtain an infinity of forms, some of which will be very striking.
If you want to reproduce these, to fix their outlines, you have only to interpose a transparent paper, to draw along the glass pane a line in pencil and to trace over the part of the picture which terminates at the foot of the pane.
Fold the transparent paper along this pencil line, and to get the whole reproduced you have only to copy over the designs just traced. The glass, which does the duty of a mirror, doubles the forms in a symmetrical way, and as it is moved new forms come to view.