Technical diagram showing a circular launch battery configured for simultaneous firing of parachute rockets 插畫檔

A detailed instructional drawing illustrates a specialized wooden and metal launching apparatus designed to hold an array of aerial rockets arranged in a tight circular cluster. The framework features a heavy central post supporting a cylindrical top collar that positions the pointed rocket heads upright, while their long stabilizing guide sticks are channeled downward through a central alignment ring to ensure a synchronized vertical trajectory upon ignition. Originating from France, this nineteenth-century engineering engraving documents the technical innovations and safety structures developed by pyrotechnicians to execute complex, multi-shot aerial spectacles and illuminated parachute displays during grand civic celebrations.