[Illustration:
Fig. 20.—Cone-former.
]
[Illustration:
Fig. 21.—Paper for Cone.
]
9. You will next require a turned wooden former on which you can make
paper cones of such a size at their base that they can be neatly pasted
on to the top of your pots—that is, the base of these cones should have
the same diameter as the pots. Although such conical caps are by no
means necessary, yet they are a very great assistance to the rocket in
its ascent, enabling it to rise with much less resistance through the
air. The cone-former is represented in the annexed woodcut (fig. 20). To
make these cones upon it, cut out as many circular pieces of brown paper
as you require, the semi-diameter of which must be slightly greater than
the height of the cones that you have to make. Then cut or tear these
circles into halves and paste them on one side. Now place the first
half-circle upon the former, pasted side outwards, taking care that the
apex of the cone beat the point marked A in fig. 21. Then fold the brown
paper neatly round the cone-former, and when you have made it to sit as
closely to it as possible, proceed in the same manner with the other
half-circle, putting it upon the first, pasted side inwards. The paper
cones thus made must next be covered with one thickness of thin paper
cut large enough to extend ½ an inch or rather more beyond the open end
of the cone, and this projecting part, when notched all round with your
scissors, can be pasted down round the top of the rocket pot. When this
is done the pot will present the appearance of annexed illustration
(fig. 22).
[Illustration:
Fig. 22.—Pot, with Conical Cap.
]