7. This may be done in two ways; for exhibition purposes I should merely
put into the mouth of the rocket some meal-powder-paste made as
follows:—Make a rather soft, but not too liquid paste, by moistening
meal-powder with gum-water made of the strength of 2-oz. of gum-arabic
to a pint of water. With the flattened end of a stick rub some of this
paste into the cup formed at the choked end of the rocket, taking care
that none of it _is left in the choke_ or narrow aperture at which the
fire from the rocket has to find vent; for, if any should remain there,
the rocket when fired is almost certain to burst. Any of the paste that
happens to be forced into this aperture may easily be taken out
afterwards by means of a piece of wire or stout pin.
Your rocket is now finished as far as its ascending power is concerned.