Definition
A volcano is a large conical or cylindrical fountain with a wide mouth, producing a very full, broad spray of sparks rather than a thin jet. Its flared base gives it natural stability: it sits on the ground without a stake. Display volcanoes throw 4 to 12 m high for 30 to 90 seconds, with silver, gold or coloured compositions using strontium, barium and copper salts; some add crackling or whistles midway. The volcano serves as the visual base of openings, fills the foreground of a display fired over water and accompanies bengal lights on façades. Consumer versions fall in F1 to F3; the heavily loaded large display volcanoes move into F4.
In practice, for the display company
A volcano is heavy and sits on the ground: it matters more in the loading plan than in the wiring. PyroDesk gives it a cue and a position on the site plan with a reduced distance; PyroSimulator renders its broad sheet and long duration, useful for checking that the foreground does not drown low shells fired at the same time.