Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury.

  • Henry De la Beche
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury. Source: Wellcome Collection.

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    ot the duchy of Cornwall, from 1750 to 1779, inclusive, 588. Account of the annual produce of the tin-mine, from 1780 to 1838, with the average price per cwt. of common tin, 589. Chemical composition of the copper-ores raised in the district, 590. Mode of dressing copper-ores in the middle of the last century, 592. Manner of doing so twenty years afterwards, ib. Mode ot dressing copper-ores at present, 5 94. Cornish method of assay- ing copper-ores, 595. Berthier’s manner of assaying copper-ores, ib. Ac- count ot the copper-ores sold at the Cornish ticketings, in the year end- ing June, 1838, 597.] Table of foreign and British ores sold by ticket for the same year at Swansea, 599. Account of the receipts and expendi- ture in 1836 of the Consolidated and United Mines, Gwennap, 600. Rate of wages paid in that year at the same mines, 602. Extent of these mines, ib. Transactions of the Consolidated Mines for eighteen years, 603. Receipts and expenditure in 1837 of the Fowey Consols Mines, ib. Ex- tent of these mines and profit realised by them, 605. Annual expendi- tuie of the largest copper-mines in 1778 and in 1800, ib. Account of the copper-ores and their value, from 1726 to 1838, inclusive, 606. Compa- rison between the produce of copper in 1737, 1787, and in 1837, in Cornwall, 607. Copper-ores raised from 1801 to 1837 in Devon, 608. Copper ad- ventures of West Somerset, 609. Manganese of the district, ib. Lead, 610. Ancient argentiferous lead-mines of Devon, 611. Silver-ores, 612. Gold, 613. Cobalt, 614. Nickel, 615. Bismuth, ib. Antimony, ib. Zinc, 6-6. Iron, 617. Arsenic, 618. Ancient stannary parliaments, tb. Ancient stannary prisons, 619. Present stannary court, 620. Num- ber of persons employed in 1836 and 1337 in the Cornish mines, 621. Total value of the exported mineral produce of the district, 623. Relative proportion of metallic produce of the district to that of other parts of the United Kingdom and the Continent of Europe, 629. Annual metallic pioduce of Great Britain and Ireland, tb. Relative proportion of the mineial pioduce of Creat Britain and Ireland to that of other European countries, ib. APPENDIX. Appendix A.—Charter of King John, dated the 29th October, 1201, to the tinners of Cornwall and Devon, 625. Charter of Edward 1., dated the 10th April, 1305, to tne tinners of Cornwall. 626. Charter by the same, and of the same date, to the tinners of Devon, 027. Petition of the com- monalty of Devon to the king in council against the conduct of the Devon tinneis, in the 1st of Edward III., 628. Petition of the same to the king in pailiament, in the 50th of Edward Ilf,, and the directions thereupon, 629. Rights claimed by the Devon tinners in 1600, ib. Appendix B. Translation of a letter from William de Wrotham and others to Hubert Archbishop of Canterbury and Chancellor of England, exhibit- ing the regulations in force respecting the tin coinage in Devon and Cornwall in the time of Richard I. and King John, 629. Appendix C. Observations by Mr. Enys on Cornish pumping-engines, more particularly relating to their progressive improvements as measured by duty, 634. Appendix D. Additional Notes.—Custom respecting the opening of the Looe Pool, Helston, 642. Note respecting the mode of occurrence of certain beds of rock near Linton, ib. Black slate of Kitley Park, 643. Sup- posed fault at Connator Quarry, ib. Chudleigh limestones, ib. Order