the glass in the groove slowly,
and when you perceive the smoke diminish, draw up the glass, that the
figure may disappear, and shut the trap door.

This exhibition will afford a deal of wonder; but observe, that all
the lights in the room must be extinguished; and the box should be
placed on a high table, that the aperture through which the light
comes out may not be seen.

There are many other pleasing experiments which may be made with the
magic lantern, but the limits of our work will not permit us to
specify them, without excluding many other equally interesting
subjects of a different nature.

_The Artificial Landscape._

Procure a box, as in Fig. 12, of about a foot long, eight inches wide,
and six inches high, or any other dimensions you please, so they do
not greatly vary from these proportions. At each of its opposite ends,
on the inside of this box, place a piece of looking-glass that shall
exactly fit: but at that end where the sight hole A is, scrape the
quicksilver off the glass, through which the eye can view the objects.

[Illustration: Fig. 12.]

Cover the box with gauze, over which place a piece of transparent
glass, which is to be well fastened in. Let there be two grooves at
each of the places C D E F, to receive two printed scenes, as follow:
On two pieces of pasteboard, let there be skilfully painted, on both
sides, any subject you think proper, as woods, bowers, gardens,
houses, &c.; and on two other boards, the same subjects on one side
only, and cut out all the white parts: observe also, that there ought
to be in one of them some object relative to the subject, placed at A,
that the mirror placed at B may not reflect the hole on the opposite
side.

The boards painted on both sides are to slide in the grooves C D E F,
and those painted on one side are to be placed against the opposite
mirrors A and B; then cover the box with its transparent top. This box
should be placed in a strong light, to have a good effect.

When it is viewed through the sight hole, it will present an unlimited
prospect of rural scenery, gradually losing itself in obscurity; and
be found well worth the pains bestowed on its construction.

_To draw, easily and correctly, a Landscape, or any other Object,
without being obliged to observe the Rules of Perspective, and without
the Aid of the Camera Obscura._

[Illustration: Fig. 13.]

Procure a box of pasteboard, A B C D, Fig. 13, of about a foot and a
half lo