In this way a reinforced piece of wood should be made, that is, bend it first with the screw, in the manner you see; then put the pieces inside, as you know how to do.

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To send a rocket to a great height. And you will do it in this way: set up your passavolante upright, as you see, and in it put the ball with the chain and rocket joined to it, inside that passavolante, leaving the rocket outside, as the figure shows. Then fit a little board with powder level with the touch-hole of the passavolante's powder. This done, you will set fire to the rocket; and this fire, falling onto the little board and the touch-hole of the powder, will give fire. And that rocket will be carried by that ball more than three miles, and there will always be seen more than half a mile of flame behind the rocket.