Water-rockets
They may be made from four ounces to two pounds. If larger, they are
too heavy; so that it will be difficult to make them keep above water
without a cork float, which must be tied to the neck of the case; but
the rockets will not dive so well with as without floats.
Cases for these are made in the same manner and proportion as
sky-rockets, only a little thicker of paper. When you fill those which
are driv
the proper charge, and on that one or two ladles of sinking charge,
then the proper charge, then the sinking charge again, and so on, till
you have filled the case within three diameters; then drive on the
composition one ladleful of clay; through which make a small hole to
the charge; then fill the case, within half a diameter, with
corn-powder, on which turn down two or three rounds of the case in the
inside; then pinch and tie the end very tight; having filled the
rockets, (according to the above directions,) dip their ends in melted
resin or sealing-wax, or else secure them well with grease. When you
fire those rockets, throw in six or eight at a time; but, if you would
have them all sink, or swim, at the same time, you must fill them with
an equal quantity of composition, and fire them together.
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