will be painted on the paper in an
inverted position, with the greatest regularity, and in the most
natural colours. If you place a swing looking-glass outside the
window, by turning it more or less, you will have on the paper all the
objects on each side the window.

If, instead of placing the looking-glass outside the window, you place
it in the room above the hole, (which must then be made near the top
of the shutter,) you may have the representation on a paper placed
horizontally on a table, and draw at your leisure all the objects
reflected.

Observe, the best situation is directly north; and the best time of
the day is noon.

_The Magnifying Reflector._

Let the rays of light that pass through the magnifying glass in the
shutter be thrown on a large concave mirror, properly fixed in a
frame. Then take a third strip of glass, and stick any small object on
it; hold it in the intervening rays at a little more than the focal
distance from the mirror, and you will see on the opposite wall,
amidst the reflected rays, the image of that object, very large, and
beautifully clear and bright.

_To tell by a Watch Dial the Hour when a Person intends to rise._

The person is told to set the hand of his watch at any hour he
pleases, which hour he tells you; and you add in your mind 12 to it.
You then desire him to count privately the number of that addition on
the dial, commencing at the next hour to that at which he intends to
rise, and including the hour at which he has placed the hand, which
will give the answer: for example.

A intends to rise at 6, (this he conceals to himself;) he places the
hand at 8, which he tells B, who, in his own mind, adds 12 to 8, which
makes twenty. B then tells A to count twenty on the dial, beginning at
the next hour to that at which he proposes to rise, which will be 5,
and counting backwards, reckoning each hour as one, and including in
his addition the number of the hour the hand is placed at, the
addition will end at 6, which is the hour proposed; thus,

The hour the hand is placed at is 8
The next hour to that which A intends to rise at is 5, which
counts for 1
Count back the hours from 5, and reckon them at 1 each, there
will be 11 hours, viz., 4, 3, 2, 1, 12, 11, 10, 9, 8, 7, 6 11
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