lens is required for making this camera-just a plain mirror set
at an angle of 45 deg., with a piece of ordinary glass underneath,
a screen with a peek hole and a board for holding the drawing
paper. The different parts may be fastened together by means of a
box frame, or may be hinged together to allow folding up when
carrying and a good tripod of heavy design should be used for
supporting it. In order to get the best results the screen should
be blackened on the inside and the eyepiece should be blackened on
the side next to the eye. A piece of black cardboard placed over
the end of the eyepiece and perforated with a pin makes an
excellent peek hole.

In operation the rays of light coming from any given object, such
as the arrow AB, strike the inclined mirror and are reflected
downward. On striking the inclined glass a portion of the light is
again reflected and the rays entering the eye of the operator
produce the virtual image on the paper as shown. The general
outlines may be sketched in quickly, leaving the details to be
worked up later. This arrangement may be used for interior work
when the illumination is good.

** Irrigating with Tomato Cans [450]

The following is an easy and effective way to start plants in dry
weather: Sink an ordinary tomato can, with a 1/8-in. hole 1/2 in.
from the bottom, in the ground so that the hole will be near the
roots of the plant. Tamp the dirt around both plant and can, and
fill the latter with water. Keep the can filled until the plant is
out of danger.
--Contributed by L. L. Schweiger, Kansas City, Mo.

[Illustration: Irrigation]

** Fountain for an Ordinary Pen [450]

Take two steel pens, not the straight kind, and place them
together, one above the other, in the penholder.

[Illustration: Two Pens In Holder]

With one dip of ink 60 or 70 words may be written. This saves time
and the arrangement also prevents the ink from dropping off the
pen.
--Contributed by L. M. Lytle, Kerrmoor, Pa.

** Homemade Mousetrap [450]

Bore a 1-in. hole, about 2 in. deep, in a block of wood and drive
a small nail with a sharp point at an angle so it will project
into the hole about half way between the top and bottom, and in
the center of the hole, as shown.

[Illustration: Hole In Wood Block]

File the end very sharp and bend it down so that when the mouse
pushes its head past it in trying to get the bait at the bottom of
the hole, the sharp point will catch it w