Model of a pair of Tilt Hammers alongside each other. Two beams and connecting rods with cranked pins at an angle to each other and one of the wheels provided with a balance weight

The model represents a design for a pair of forge hammers to work metal driven by two engines side by side. Such a scheme was prepared by Matthew Boulton and James Watt for John Wilkinson in 1781 for his Ironworks at New Willey, Shropshire, but was not proceeded with because it embodied the crank, and Watt feared litigation with Pickard, who had patented the application of this to engines.