The chair is now hung up to the porch ceiling with ropes attached to a large screw eye or hook.  The end of the chair to be used for the lower part is held about 16 in. from the floor with ropes direct from the grooves in the end pieces to the hook.  The upper end is supported by using a rope in the form of a loop or bail, as shown in Fig. 2.  The middle of the loop or bail should be about 15 in. from the end piece of the chair.  Another rope is attached to the loop and through the hook and to a slide as shown.  This will allow for adjustment to make 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 the position of the hinge joint on the arm of the washing machine, as shown in Fig. 2.  The pressure at the nozzle is about 20 lb. per square inch, and is sufficient to drive the waterwheel under all ordinary circumstances.  —­Contributed by P. J. O’Gara, Auburn, Cal,