Zinc discs, painted one side white with broad red line across the centre James Watt's Garret Workshop 1772-1773
Pair of ebony violin fingerboard shape and sized hollow fabrications James Watt's Garret Workshop 1758-1773
Eight ebony violin fingerboard shape and sized hollow fabrications James Watt's Garret Workshop 1758-1773
One packet, 'experiment paper on copying', from James Watt's workshop James Watt's Garret Workshop 1780
1 Pulley 2¼” dia. on tapering spindle, with 3 milled ball cutters James Watt's Garret Workshop 1758-1769
Portrait mezzotint print from engraving of Phelps Thomas and Bartlett John, 1778 James Bretherton 1778