_A Gerb of Fire._—On white paper draw the figure of a gerb of fire, lay
it on quite opaque paper, black on both sides, and with a very sharp
penknife cut several slashes at unequal intervals from the gerb centre;
pierce these breaks with holes to represent the sparks. The lines and
holes both paint the effect of burning powder issuing from a small
aperture.
[Illustration: Fig. 133.]
_Globes, Pyramids, or Revolving Columns._—Draw the outlines on paper,
and cut them out in a helical or spiral form. For the various tints,
paste coloured transparent paper at the back.