Now all you have to do is to lay a picture or a flat object, such as a leaf or a butterfly, on one side of the glass and a sheet of paper on the other side and look into the glass at a sharp slant, or acute angle would be the better term, and you will see the picture projected plainly on the paper so that you can easily draw it in with a pencil.
How to Make Tracings.
—A very easy and effective way to copy any picture already drawn, or even a photograph, in line, is to use tracing paper.
This kind of paper, which you can buy of any dealer in drawing materials, is quite transparent and very tough. To make a tracing lay the drawing you want to copy on your drawing board, then lay the tracing paper on top of it, rough side up, and push a thumb tack into each corner to hold them together.
Now trace the outline of the picture with a pencil and then draw in the lines with India ink. If the paper does not take the ink readily rub the surface of it with a little powdered chalk on a soft rag. You can make as many duplicate copies as you want by using a printing frame and blue paper according to the [directions] given in the [next chapter].
To Make Lasting Impressions.
—Here is an easy way to make lasting impressions of your own and your friends’ finger prints and hands.
Take a sheet of heavy glazed white paper, say 5 × 7 inches, and hold it over a kerosene lamp with the chimney removed and the top of the burner thrown back so that the flame will smoke like a locomotive. Keep moving the paper about to make the soot, which is simply particles of nearly pure carbon, cover the surface of the paper as evenly as possible.
Fig. 53. a lasting carbon (soot) impression of your hand