To force a Wheel round with Gunpowder ABC of Cast Iron, with an Inch squ. [?] Groove [in] the Sweep Face next the Wheel capable of receiving the Edge of the Wheel, which is likewise an Inch thick.

The Wheel not an exact Circle, but has a Shoulder at D, which comes down on the Charge of Powder confin’d in the Groove at E.

F a Piece of Wood, 1 Inch wide and 2 deep, to slide in a hole G thro’ the Piece ABC to come under and support the Charge of Powder, and to be push’d back by the Widening of the Wheel when it comes round. By this Method, the Force of Gunpowder may possibly be apply’d to the raising of Weights, bending great Springs, and the like.