Pair of ebony violin fingerboard shape and sized hollow fabrications James Watt's Garret Workshop 1758-1773
Model of cylinder with separate condenser, formerly described as the "original" model. Watt's second separate condenser, 1765. Motive Power 1765
Eight ebony violin fingerboard shape and sized hollow fabrications James Watt's Garret Workshop 1758-1773
Zinc discs, painted one side white with broad red line across the centre James Watt's Garret Workshop 1772-1773