| Description | (Book of calculations for engines for various Cornish mines, as follows:)
p. 3. Tresavaine Engine. 12 Jun. 1779.
4. Rods for Poldory Engine. 29 Jun. 1779.
5-6. Calculations concerning beams for United Mines. 3 Aug. 1779.
7. Tresavean Mine. 12 Oct. 1779.
7-8. Calculations founded on Wheal Chance Engines. 15 Oct. 1779.
9. Wheal Treasury Mine. 27 Oct. 1779.
11. Trevenan, Tremonize and Buttervenick Mines near Helston; Mr. Wills of Helston and others Adventurers in November 1779.
14. Calculations for Wheal Chance in Cambourne. 19 Dec. 1779.
15-16. Calculation delivered to Mr. Kevill of Cambourne [Pool and Penhallack Mines]. 12 Jan. 1780.
17. Calculation for a long boiler for Tresavean.
18. Poldice New 63.
19. Poldice First Engine.
20. Wheal Treasury Boiler. 6 Mar. 1780.
21-23.Table for Engines proposed on Wheal Virgin, Maid & Waist [West] Wheal Virgin Mines Oct. 30 1779 formed from the 2 Engines at Poldice.
23-25. State of Wheal Virgin Engines at first setting out.
27. [Table of Wheal Virgin Engines.]
27. Proposals for the sizes of the pumps by Mr. Hornblower for the above mines.
28. Standards for the Consumption of a 63 inch cylinder and 9 foot stroke calculated by the same rule as Wheal Union.
28. Calculation for 52 Inch cylinder & 8 foot stroke.
28. 48 inch cylinder.
31. Wheal Chance 2 Old Engines, New Engine. |