| Description | Small bundle, containing the following items:
Wrapper.
No. 1. Graph. "Consumption of a Common Fire Engine 60 inch under different
Loads & making 6 strokes per minute for 24 hours."
No. 2. Memorandum about the engines at Wheal Virgin and North Downs.
(In Matthew Boulton’s hand.)
No. 3. Memorandum and calculations about the engines at Wheal Virgin and North Downs.
(In Matthew Boulton’s hand.)
No. 4. Memorandum and calculations about the engines at Wheal Virgin and North Downs. 2 sheets.
(In Matthew Boulton’s hand.)
No. 5. Printed paper. "Proposals to the Adventurers in — by Boulton & Watt."
"Method of calculating tables for Cornish engines." (Paper for working out details of engines in comparison to the Poldice Eastern engines. Marked "Corrected Copy.")
No. 6. Graph. Depths of shafts at North Downs mines.
(With a sketch plan of the mines on the back.)
[No. 7 missing.]
No. 8. "Savings of Consolidated Mines Engines [Wheal Virgin] by the counter from Jan. 1783 [to Sep. 1784].
(In Thomas Wilson’s hand.)
No. 9. Calculations for the North Downs engines.
(In Matthew Boulton’s hand.)
No. 10. Memorandum about the North Downs engines.
No. 11. "Rough Calculations."
(In Matthew Boulton’s hand.)
—. Rough notes and calculations.
(In Matthew Boulton’s hand.)
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