the device into a chair or a hammock.
--Contributed by Earl R. Hastings, Corinth, Vt.

** How to Find the Blind Spot in the Eye [129]

Make a small black circular dot 1/2 in. in diameter on a piece of
cardboard and about 3 in. from the center of this dot draw a star.
Hold the cardboard so that the star will be directly in front of
one eye, while the dot will be in front of the other. If the star
is in front of the left eye, close the right eye and look steadily
at the star while you move the cardboard until the point is
reached where the dot disappears. This will prove the presence of
a blind spot in a person's eye. The other eye can be given the
same experiment by turning the cardboard end for end. The blind
spot does not indicate diseased eyes, but it simply marks the
point where the optic nerve enters the eyeball, which point is not
provided with the necessary visual end organs of the sight, known
as rods and cones.

** Beeswax Substitute [129]

A wax from the rafie palm of Madagascar is being used as a
substitute for beeswax.

** Home-Made Water Wheel Does Family Washing [129]

[Illustration: Water Wheel]

The accompanying sketch illustrates a very ingenious device which
does the family washing, as well as to operate other household
machines. A disk 1 in. in thickness and 10 in. in diameter was cut
from a piece of rough board, and on its circumference were nailed
a number of cup-shaped pieces cut from old tin cans. A hole was
then bored through the center of the disk and an old piece of iron
rod was driven through to form a shaft. Two holes were then bored
opposite each other through the sides of a wooden box in which the
disk was placed, allowing the shaft to project through the holes.
A small grooved wooden pulley was driven tightly on one of the
projecting ends of the shaft. The top of the box was then tightly
closed and a hole, large enough to admit the nozzle of a garden
hose, was bored so that the jet of water would flow upon the tin
buckets that were nailed to the circumference of the wheel or
disk. Another hole was bored in the bottom of the box large enough
to allow the waste water to run away freely. A belt, made from an
ordinary sash cord, was run from the small pulley on the
waterwheel to a large pulley, as shown in Fig. 1. A pitman was
attached to the large pulley, which operates the washing machine
by its reciprocating motion, and the length of the stroke is
adjusted by moving t