Transactions of the Royal Geological Society of Cornwall, Volumes 3-4Vol. 6, includes the society's annual reports for 1844-46. |
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Common terms and phrases
abounds adjoining angle appears beds blue slate Botallack bowlders calcareous Carne Carnkie chlorite clay cliffs colour compact rock compact-felspar composed considerable consists contains copper copper mines Cornish Cornwall Cove crystalline crystals dark decomposed decomposition Delabole deposit depth diluvial diluvium disintegrated district elvan eurite extends fathoms feet felspar fine-grained fissile geological grains Grampound granite granular greenstone growan hill hornblende hornblende-rocks hornblende-slate Huel imbedded inclined iron killas kind lamellar laminæ Lanescot latter layers limestone lodes mass massive rock metal mica mile mineral Mount's Bay nature numerous observed occurs Padstow pebbles Poldice Polgooth porphyritic portion present probably produce quantity quarry quartz quartz-veins resembling sand schistose schistose rocks serpentine shaft shew shorl shorl-rock side similar situation slate specimens spot steatite stone strata stratum stream stream-works substance surface talc thick tin ground tin-ore tion Tons traversed valley variety veins
Popular passages
Page 89 - Britain, for at the full tide, the intervening passage being overflowed, they appear islands, but when the sea retires a large space is left dry and they are seen as peninsulas. From...
Page 28 - ... bottom of the sand, and one of these with other fossils was presented by Colenso to the Royal Geological Society of Cornwall. In the upper part of this sand nearer the mouth of the harbour, the bones of a large whale were found. The sea at this time seems to have extended about a mile up the valley. (g) A bed of rough river-sand and gravel, here and there, mixed with sea-sand and silt. About 20 feet in thickness. In this sand was found "the remains of a row of wooden piles, sharpened for the...
Page 208 - Mr. NEWCOMB. Anywhere within a range of five miles. Mr. SUTRO. The tunnel is not quite four miles in length, and a mile or a mile and a half either way would reach any mine? Mr. NEWCOMB. An hour would be the outside of the time required to get timbers in. They could have a telegraph established between the interior workings of the mine or the tunnel to the mouth of the tunnel. Q. How many men do they lower at a time into these shafts?
Page 88 - These prepare the tin, working very skilfully the earth which produces it. The ground is rocky, but it has in it earthy veins, the produce of which is brought down and melted and purified. Then, when they have cast it into the form of cubes, they carry it to a certain island adjoining to Britain, and called Iktis.
Page 70 - patent, whosoever will work, be tin at what price soever, " they have four shillings a week truly paid : there is no " poor that will work there, but may, and have that wages.
Page 69 - I take some imputation of slander offered to her Majesty, I mean by the gentleman that first mentioned tin; for that being one of the principal commodities of this kingdom, and being in Cornwall, it hath ever, so long as there were any, belonged to the Dukes of Cornwall, and they had special patents of privilege. It pleased...
Page 88 - The inhabitants of that extremity of Britain, which is called Belerion, both excel in hospitality, and, also, by reason of their intercourse with foreign merchants, are civilised in their mode of life.
Page 372 - Cornwall,' vol. iii. pp. 208 — 246 ; and ' An account of the discovery of some varieties of Tin Ore in a vein, which have been considered peculiar to streams, with remarks on Diluvial Tin in general,
Page 225 - ... are carefully separated. The clay is next conveyed to the floor of the washing place : and is then ready for the first operation of the process. A heap of the clay being placed on an inclined platform, on which a little stream of water falls from the height of about six feet, the workman constantly moves it and turns it over with a piggle and shovel; by which means, the whole is gradually carried down into an oblong trench beneath, which is also inclined and which ends in a covered channel that...
Page 226 - The water, still holding in suspension the finer and purer panicles of porcelain clay, next overflows into larger pits, called ponds, which are of the same depth as the first pits, but about three times as long and wide. Here the clay is gradually deposited, and the clear supernatant water is from time to time discharged by plug-holes on one side of the pond. This process is continued until, by successive accumulations, the ponds are filled. At this stage the clay is in the state of a thick paste...