ases be
fixed the contrary way, which will make the wheel run back again; for
the case at top you may put a small gerbe; and let the cases on the
spokes be short, and filled with a strong brilliant charge.

_Illuminated Spiral Wheel._--First have a circular horizontal wheel
made two feet diameter, with a hole quite through the nave; then take
three thin pieces of deal, three feet long each, and three-fourths of
an inch broad each: nail one end of each of these pieces to the fell
of the wheel, at an equal distance from one another, and the other end
nail to a block with a hole in its bottom, which must be perpendicular
to that in the block of the wheel, but not so large. The wheel being
thus made, have a loop planed down very thin and flat; then nail one
end of it into the fell of the wheel, and wind it round the three
sticks in a spiral line from the wheel to the block at top; on the top
of this block fix a case of Chinese fire; on the wheel you may place
any number of cases, which must incline downwards, and burn two at a
time. If the wheel should consist of ten cases, you may let the
illuminations and Chinese fire begin with the second cases. The
spindle for this wheel must be a little longer than the cone, and made
very smooth at top, on which the upper block is to turn, and the whole
weight of the wheel to rest.

_Double Spiral Wheels._--For these wheels, the block or nave must be
as long as the height of the worms, or spiral lines, but must be made
very thin, and as light as possible. In this block must be fixed
several spokes, which must diminish in length, from the wheel to the
top, so as not to exceed the surface of a cone of the same height. To
the ends of these spokes nail the worms, which must cross each other
several times: close these worms with illuminations, the same as those
on the single wheels; but the horizontal wheel you may clothe as you
like. At the top of the worm place a case of spur-fire, or an amber
light.

_Balloon Wheels._--They are made to turn horizontally: they must be
made two feet diameter, without any spokes, and very strong, with any
number of sides. On the top of a wheel range and fix in pots, three
inches diameter and seven inches high each, as many of these as there
are cases on the wheel: near the bottom of each pot make a small vent;
into each of these vents carry a leader from the tail of each case;
load some of the pots with stars, and some with serpents, crackers,
&c. As th