Pyrotechnia or, A discourse of artificiall fire-works in which the true grounds of that art are plainly and perspicuously laid downe: together with sundry such motions, both straight and circular, performed by the helpe of fire, as are not to be found in any other discourse of this kind, extant in any language. VVhereunto is annexed a short treatise of geometrie, contayning certaine definitions and problemes, for the mensuration of superficies and sollids, with tables for the square root to 25000, and the cubick root to 10000 latus, wherein all roots under those numbers are extracted onely by ocular inspection. VVritten by Iohn Babington gunner, and student in the mathematicks.

Babington, John., Droeshout, John, d. 1652, engraver.

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A Treatise of ARTIFICIALL FIRE-WORKS, most of them being invented and ap∣proved by the Author.

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CHAP. XLVI. How to make another sort of Balles for the ground, which will be a long time in their motion.

CAuse a ball to be made of some light wood, and let it bee hollowed, to make it the lighter; then fit in two pieces of wood, so that you may make both sides equall, which pieces of wood shall be so groofed, that you may lay in so many Rockets as may well be contained about it, pro∣viding that at the end of each groofe or rocket, you may have a vent thorow your ball, then place in your rockets as I have shew∣ed you for the wheele: which having done, glue them fast in, to the end, that by the motion of the ball, they may not be disordered, then ioyne your ball together, and glue it fast with paper round about it, to the end the vents may be covered, onely leaving one open to fire it, so have you this ball finished, which firing, will continue a long while in motion, Figure 36.

A The ball turned hollow with groofes to lay in your rockets.
B The other part of the ball, with the rockets fastened in.
C C C C The vents at the end of each rocket.

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