haped cover and bind it with wide webbing, 3 in.
across and having eyelets at the seams for attaching the stay
ropes. Near the apex of the cover cut three triangular holes 8 in.
long and 4 in. wide at the bottom and hem the edges. These are
ventilators. Make the tent wall of the same kind of cloth 2 ft. 2
in. high. Bind it at the upper edge with webbing and at the bottom
with canvas. Also stitch on coarse canvas 6 in. wide at the
bottom, and the space between the ground and the wall when the
tent is raised, fill with canvas edging. Stitch the upper edge of
the wall firmly to the bell cover at the point indicated by the
dotted line, Fig. 2.

For the top of the tent have the blacksmith make a hoop of 1/4-in.
round galvanized iron, 6-in. diameter. Stitch the canvas at the
apex around the hoop and along the sides. Make the apex into a
hood and line it with stiff canvas. Have the tent pole 3 in. in
diameter, made in two sections, with a socket joint and rounded at
the top to fit into the apex of the tent.

In raising the tent, fasten down the wall by means of loops of
stout line fastened to its lower edge and small pegs driven
through them into the ground, Fig. 5. Run the stay ropes from the
eyelets in the circular cover to stakes (Fig. 5) stuck in the
ground. Use blocks, as in Fig. 6, on the stay ropes for holding
the ends and adjusting the length of the ropes.

** Simple X-Ray Experiment [190]

The outlines of the bones of the hand may be seen by holding a
piece of rice paper before the eyes and placing the spare hand
about 12 in. back of the rice paper and before a bright light. The
bony structure will be clearly distinguishable.
--Contributed by G.J. Tress, Emsworth, Pa.

** How to Make a Candle Shade [191]

Layout the pattern for the shade on a thin piece of paper, 9 by 12
in., making the arcs of the circle with a pencil compass. As shown
in the sketch, the pattern for this particular shade covers a half
circle with 2-3/4 in. added. Allowance must be made for the lap
and as 1/4 in. will do, a line is drawn parallel 1/4 in. from the
one drawn through the center to the outside circle that terminates
the design.

Nail a thin sheet of brass, about 9 in. wide by 12 in. long, to a
smooth board of soft wood, then trace the design on the brass by
laying a piece of carbon paper between the pattern and the brass.
After transferring the design to the brass, use a small awl to
punch the holes in the brass along t