Gerb (pyrotechnic)

A gerb is a type of firework which produces a jet of sparks, usually lasting between 15 and 60 seconds.

Sometimes a small charge of black powder is added to the bottom of a gerb to make it finish with a bang: this charge is known as the 'bounce'.

Gerbs intended for use indoors near a proximate audience, such as at a rock concert, typically have shorter durations (from 1⁄8 to 30 seconds) and heights (4 to 50 feet).

Gerbs are usually measured in terms of time and height.

Eric Newby's book The Last Grain Race (chapter two: "Mountstewart") contains a 1938 reference to what appears to be the original gerb—in effect a mortar bomb fired from a mortar.