Drawing, bob and motion guide for 14 3/4" double acting rotative engine by Boulton and Watt, pencil / ink / paper, Cornwall, England, 12 July 1797
Ink and pencil working sketches showing parts of the 14 3/4" double acting rotative engine designed by Boulton and Watt. On one side of the sheet of paper is a sketch showing the aerial view of a bob. On the reverse is a sketch showing the end view of the motion and guide for the engine at the Wheal Carpenter Mine. Sums and working notes can be seen on both drawings.
Title handwritten at top of page 'Bird Eye view of the Bob'. Title on reverse side reads 'End view of Wheal Carpenter Motion and guide'.