Oldalképek
PDF
ePub

Class 1. Mining and Mineral Products.

tools, from Perron Porth, near Truro; Lastwithiel; Feock, near Truro; Kenwyn, near Truro; and other localities.

Wolfram, from various tin-mines in Cornwall, used as a mordant in dying calicoes.

Varieties of rarer minerals, from various parts of Cornwall.

Dyer, William Bunt, Mold—Proprietor. White lead ore, carbonate of lead ore, from Jamaica mine. Assay, 60 per cent, for lead, and four ounces of silver per ton of lead.

Fatle, Benjamin, & Co., Old Swan Lane, Upper Thames Street—Proprietor. Specimen of blue potters' clay, as dug from the pits at Norden, Isle of Purbeck, county of Dorset; used for the manufacture of earthenware; said to possess greater strength of body, and to shrink less than many other clays when exposed to high heat.

Kino, George, Demidgc Lodge, Qazeley, near Newmarket—Manufacturer. Red brick earth as dug from the pit. Red building bricks, pamment bricks, and coping bricks made from the earth.

Michkli., Sarah, St. Austell. White china clay, for manufacturing china and earthenware, also for bleaching paper, calico, &c.

Fisher, Frederick, Woolpit, Suffolk
Manufacturer.
Specimens of Woolpit brick-earth.
White building bricks.
Pamment bricks and draining pipes.

Simons, Thomas, Birmingham—Manufacturer. Specimens of raw and burnt clay:—Lumps of glasshouse pot, rough, and fit for use. Lump of coke and finer. Casting pot, &c, in different stages, and finished. Muffles, &c. Portable furnaces for chemists and others. Glass-house pot. Stove liners. Retorts. Crucibles.

Deerino, James, Middleton, Cork, Ireland— Producer. Various materials obtained at Rostellan, county of Cork, Ireland, adapted for use in the manufacture of the better kinds of porcelain and earthenware. These include samples as raised from the mine, which was opened in 1850, and the different substances as used in the arts, and articles of earthenware and glass, manufactured from them.

Fahie, James K., Tipperary, Ireland-*
Producer.

Copper ore, found on Lord Stanley's property, near Tipperary, and from Hollyford.

Lead ore, found at Oola, near Tipperary.

Minerals from several parts of the country.

Anthracite coal, from Killanaule.

Building limestone, found near Tipperary.

Black and white marble, found at Mitchelstown, county Cork. Red and grey marble, found at Cloyne.

Hydraulic limestone, found near Tipperary; a natural cement, produced in powder and biscuit.

Artificial cement, prepared from chalk, alluvium, and pit clay; and stucco, for interior work; prepared from gypsum found in a limestone quarry near Tipperary.

White clay, in its rough state, found near Caher, and prepared in biscuit and small bricks, used for stone ware and pottery. Black clay, in its rough state, found at Killanaule. Black fullers' clay, found near Caher, in a stratum over white clay.

Felspar, from Lord Kingston's cave, county Cork.

Draining tiles and pipes, made on Lord Stanley's property, near Tipperary.

Sands, white silica, found at Killonan, useful for heavy iron castings and other purposes. White silica, found near Caher, used for pottery, &c. Manganese, found at Springhouse.

Inorganic vitreous matter, the produce of green ash and elm, calcined in a brick kiln by the exhibitor.

Irish laburnum candlesticks. Boxes and shoes of the same wood.

Black oak vases, and duster of carved vines; door and window furniture.

Water, from a well in the rock of Cashel, lately discovered, about 150 feet above the general level of the surrounding surface.

Browne, William, St. Austell— Proprietor. Specimen of china clay, derived from the decomposition of felspar, extensively used in the manufacture of china, porcelain, and Parian, for ornamental vases, busts, and all articles that require particular care and delicacy in moulding, and (by a recent patent) to be employed in the manufacture of ornamental stone, facing, flooring, and tiling, various articles of furniture, &c.

[A very large quantity of valuable china clay and china stone are found naturally and prepared artificially in Cornwall and Devon, chiefly from the St. Austell decomposing granite, and the southern granite of Dartmoor. About 14,000 tons of prepared and 30,000 tons of natural china clay are annually exported, chiefly to the potteries. —D. T. A.]

One of a series of reports published monthly, containing a description of the duty performed by the steamengines used in the mines of Cornwall and Devon.

The various engineering details of the engine and its work are given in these reports on a new method.

Marttn, Elias, St. Austell—Producer and Manufacturer. Specimens of China clay, or kaolin, used in the Staffordshire potteries, in bleaclung, and in paper making. China stone.

Martin, Rebecca, Higher Blowing Rouse, St. Amtell—Producer. Porcelain or china clay, natural, and as prepared for the market.

Silicious sand, used in the manufacture of glass and china stone, and in glazing and enamelling earthenware.

Cowper, John, Alston, Cumberland—Proprietor.

Sulphate of barytes, a large crystal from Dunfell, Cumberland.

Witherite (carbonate of barytes) from Fallowfield, Northumberland.

Sulphate of barytes, found in witherite.

Bromlite (baryto-calcite) on bitterspar and pseudomorphous quartz; from Brownley Hill, Alton, Cumberland.

Carbonate of barytes, from Fallowfield, Northumberland; used in the manufacture of plate, crown, sheet, and Dottle glass, chemical works, &c.

Barytes and galena, from the same quarter.

Coal, galena, shale, &c.

Carbonate of lime, from Alton, Cumberland.

Greaves, R., Warwick—Proprietor and
Producer.

Blue lias limestone, with samples of the lime in the lump and ground.

Models in lias, Portland, and improved Roman cement.

Blocks of concrete, made in lias, Portland, and Roman cement, and ground-lias lime.

Brick-work cut from the Copenhagen tunnel in the Great Northern Railway, and set in lias lime. Ornaments cut and set in the same, to show the adhesiveness of the mortar.

Lias flag-stone, adopted for hall, church, and housefloors, being hard and dry.

Lithographic stones.

[ocr errors][ocr errors][ocr errors][ocr errors][table]
[ocr errors][merged small]

Sweetma-n, John, Sutton County, Ireland— Proprietor. Blue limestone, containing about 90 per cent, of carbonate of lime. Dolomite, containing about 40 per cent, of carbonate of magnesia. Cement marie with dolomite. Quartz rock for road metal. Steatite, for pottery or silicated soap. Brown haematite iron ore. Black oxide of manganese, containing about r»3 per cent, of oxygen. Umber. Yellow and brown ochre. White sand, for manufacture of glass.

[Dolomite occurs in various places in Ireland, in veins in the limestone districts, particularly where intruded rocks are near. On the south side of Belfast Lough, at Jlolywood, it appears also as a distinct rock in a stratum about GO feet thick. The best kinds contain from 18 to ubout 22 por cent, of magnesia.—D. T. A.]

[ocr errors]
[ocr errors]

Freemas, Saxuel, OoiMrWJ Dotttm, tar HJifax
—Producer.

Laminated nae?tone, from Pearson Brow Quarry, in Hipperholme, Yorkshire, and from Xorthowram. near Halifax, from Cromweld Bottom and Southowram, and from Hove Edge and Elland Edge, Yorkshire.

Blackstone, from Bin^by, near Halifax, and from the Elland Edge Quarry, a bed free from lamina?.

All these stones lie above the two known lowest beds of coal in England, and below the level of the other beds. The laminated stones are split into flags for paving, &c.

Sandstone from the quarries at Greetland, near Halifax, Yorkshire; it lies below the level of any of the known beds of coal.

[The lower coal measures of Yorkshire contain some excellent grits, well adapted for building and paring. Some of the latter are well known and very widely used throughout England.—D. T. A.]

Local Committee, St. Austell— Collectors.

Alluvium, in which stream tin ore is found. The ore as prepared for sale. Specimens of pebbles of tin ore.

Building stones from the vicinity of St. Austell, prepared in cubes.

Freeman, William & John, MUlbank Street, Westminstei—Producers. Several varieties of material used for constructions, namely:—

Granites from Lamoma, near Penzance; from Constantino, nearHelston; from Carnsew, Mabe parish, and Folkaiiago, Stithiau's parish, near Penryn; from Zennor, near St. Ives; and from Hosemorran, Gulval, Cornwall, hoggmtor granite, countv Devon; Aberdeen granite, and Feterhead.granite, from Stirling Hill quarries, Aberdeenshire; Dalkey or Dunleary granite, county Dublin; Ireland, and Guernsey and Herm granite used for macadam

Class 1. Mining and Mineral Products.

ising roads. Polyphant atone from Lewannick, near Launceston.

Limestones.Purbeck marble, from Swanage, Dorset; the top vein in the quarry, used anciently in churches and cathedrals. Purbeck stone, called Laning vein, the second stratum from the top, used chiefly for door steps and street curbs; freestone, third vein, used chiefly for building; stone, from Down's Vein, fourth from the top of the quarry, used for footway paving; stone, called feather, fifth vein, used in church building; Btone, five bed and cap used for carriageway paving and building purposes; Portland. Portland Stone, from West Cliff and from Bill quarries; from the Waycroft quarries; from the Trade quarry, and from the Vera Street quarry, all in the isle of Portland. Portland Poach, the upper part of the regular stone beds ; the lowest bed, used for troughs, sinks, &c. Path stone, from the Farleigh Down quarries; from the Box quarries, and from Coombe Down quarries. Limestone, from Hooe lake, Plynistock; used for agricultural purposes, for footway pavements, and building. Caen stone, from the quarries of M. Jobert.

Macnesian Limestone, from the estate of the Misses Gascoigne; Huddlestone stone, near Sherburne, Yorkshire.

Sandstones.—DarleyDale stone, from Stancliff quarry, near Bake well, Derbyshire; Cromwell bottom stone, from the estate of Samuel Freeman, Esq., Southowram, near Halifax, Yorkshire. Bradford stone, from the quarries at Heaton. Potter Newton stone, and Gipton wood stone, from the neighbourhood of Leeds. Bramley Fall stone, fromMeanwood quarries, near Leeds; and from Horsforth quarries, near Leeds. Gazby stone, from quarries near Bradford.

Kentish rag, from the quarries of Mr. Bousted and Mr. Seager, near Maidstone.

Fire stone, from the quarries of Mr. Stedall, Oodstone, Surrey.

Slates and Schists.—Caithness slabs, used very extensively for paving.

Valentia slate stone, from the island of Valentia, Kerry, Ireland: the Blate is non-absorbent; experiments made by Messrs. Bramah showed that inch cubes required nearly six tons to crush them.

Marble.—Green, and black marble, from the estate of Mr. Martin, county Galway, Ireland.

[Most of the materials commonly used in construction in Loudon are illustrated in the above collection. The Cornish granites and the Portland stones may, however, be selected as requiring notice here. Of the former, those shipped from Penryn are the best known, but the quantity annually exported varies very greatly, and the qualities are also variable. The different kinds exhibited will give some idea of their appearance. The Portland stone is well known, and very excellent, but costly, and rather heavy; it contains 95 per cent, carbonate of lime, 1 silica, and 1 carbonate of magnesia: specific gravity = 2'145, and cohesive power moderate. The upper beds above the freestone are the top-cap, skull-cap, and roach, the latter forming a good stone; the next bed is the best or top-bed, from 3 to 8 ft. thick, and this is succeeded by the middle or curf-bed, and an inferior bottom bed. The position of the Portland stone is in the upper part of the upper oolites.—D.T.A.]

The Truro Local Committee—Proprietors.
Whitley, Nicholas, Truro.

Varieties of clays, from various districts of Cornwall, used for fire-clay, coarse pottery, pigments, and agricultural manure.

Hicks, Thomas, Truro,

Varieties of porphyry, for various purposes.

[The porphyries of Cornwall and other districts, where the primary and protrusive rocks prevail, have been neglected up to the present time. In the decoration of

Osborne, and some other of the royal residences, ornamental stones of British porphyries, and other ornamental stones, have been used. Many of them are of a beautiful description, susceptible of the highest polish, and all very durable. The greenstones, or as they are sometimes called ironstone porphyries, are now being introduced into London for road-making, and it appears to prove an exceedingly good material for that purpose. —R. H.]

Rodd, T. H., Esq., Trebartha Hall, near Launceston—Proprietor. Varieties of porphyry, for ornamental and building purposes.

Jenkins & Stick, Truro—Proprietors. Varieties of porphyry, from Tremone in Withiel.

Whitley, Nicholas, Truro. Varieties of porphyry.

Haigh, John, Godlci/ Cottage, near Halifax— Producer. Specimens of freestone from Northowram quarries, near Halifax. Block, in its natural state; block, variously dressed.

Flag, for causeways and floors of buildings.
Millstone grit, from Halifax.

Johnston, George, Craig'.nth, Edinburgh—
Producer.

Stone from Carlingnose quarry, North Queensferry, Scotland. This stone has been extensivoly used in Scotland, England, and Wales; more especially at Her Majesty's dockyards at Woolwich, Sheernoss, and Chatham; for the breakwater at Warkworth (Northumberland); at Newcastle, Sunderland, and Hartlepool; and in paving the Imperial Museum at St. Petersburg.

Stone from Barnton Mount quarry, near Edinburgh: this stone can be procured in large blocks, and in any quantity. Specimen of paving stones from the same granite quarry.

Specimen of Btone from Craigleith quarry, near Edinburgh; much used for stairs, landings, aud fine pavings; may be Been applied to those purposes at the British Museum, Royal Exchange, Custom House, &c, London.

[The Craigleith stone is a sandstone of the carboniferous series, consisting of fine quartz grains with a silicious cement, and occasional plates of mica. It is obtainable of any practicable length aud breadth, and up to 10 feet thick. Weight, per cubic foot, 146 lbs. It consists of more than 98 per cent, of silica, and 1 por cent, carbonate of lime.^D. T. A.]

Bewick, Joseph, Grosmont, near Whitby— Agent. Calcareous ironstone from the iron mines of Mrs. Clark, of Hollins House, Grosmont, in the valley of tho Esk.

Sandstone from the estate of Mrs. Clark, at Fairhead, near Grosmont.

Petrified shells found in the ironstone beds.

Barry & Barry, Thomas and Jacob, Mavgan St. Columb—Producers. Firestone, a soft-grained elvan or porphyry, from quarries near Newquay, used for lining limekilns and furnaces.

[The elvans (porphyritic dykes) of Cornwall are used for various purposes of construction, but it is only occasionally that they yield firestones.—D. T. A.]

Chamberlain, Thomas, Ashh;i<Ie-la-Zouch, Leicestershire—Manufacturer. Stones for burnishing all kinds of plate and gildod work, both in the rough and prepared state.

Kay, J., Hnijhill Ochiltree—Manufacturer. Curling stone, made of greenstone trap.

Class 1. Mining and Mineral Products.

Qr Ii.liam & Cheer, Castletown, Isle of Man—Producers.

Slabs of Poolvash black marble, inlaid with red and yellow composition, to imitate encaustic tiles.

Plain polished slab of Poolvash black marble.

Table of Poolvash grey shelly marble, with encrinital column.

National tile one foot square. Poolvash black marble, with the arms of England, Scotland, Ireland, Wales, and the Isle of Man, in figures inlaid in red.

Slab of black marble, for chess table, inlaid with various marbles of the Isle of Man.

Marble candlesticks.

Wreath of flowers in Poolvash black marble.

Ccmmino, Rev. Joseph George, Castletown, Isle of Man.

Black flagstone (Posidonia schist), from Poolvash, Isle of Man. Exported from Castletown. The quarries have been wrought upwards of 200 years. The steps of St. Paul's Cathedral are from these quarries; they were presented by Bishop Thomas Wilson. Used largely for flooring, chimney-pieces, tomb-stones, and, as suggested by the exhibitor, inlaid with a red composition to imitate encaustic tiles. Easily and economically wrought.

Grey marble (encrinital and shelly limestone), from Poolvash. Exported from Castletown. Used for tables and chimney ornaments.

Black marble (lower carboniferous limestone), from Port St. Mary, Isle of Man. It is hard and durable, and takes the good natural polish; raised in blocks and flags of great size. Used for piers, floorings, tomb-stones, and burnt into a strong lime.

Pale marble (carboniferous limestone), from Scarlett, Me of Man. Exported from Castletown. Castle Rushen (900 years old), King William's College, St. Thomas's Church, Douglas, and Castletown pier are built from these quarries. It is durable, and easily raised.

Spanish-head flagstone (clay schist). It is exported from Port St. Mary, used for lintels and gate-posts, and in ancient times for Runic monuments, and is durable and slightly elastic in thin flags, and can be raised in squares of 16 feet each way.

Peel freestone (old red sandstone), from Craig Mallin, Isle of Man. Exported from Peel. A large portion of Peel Cathedral was built of it in 1226.

Granite, from South Barrule, Isle of Man. Quarries lately opened, and the church of St. John built from them. Old fonts on the island, were formed from boulders of this granite. Exported from Douglas, Peel, and Castletown.

Porphyritic greenstone, from Langness, Isle of Man. Good road material. May be obtained and shipped in any quantity at Derby haven.

Haematite. Iron ore from the glebe vein, Maughold, Isle of Man. Exported from Ramsey.

White carbonate of barytes, from the Cross vein, South Barrule. A vein 5 feet thick, but not raised for the market.

All the quarries on the island belong to the Crown.

[The different building and road materials, above referred to, will be found to present some rocks of considerable interest, hitherto little used for economic purposes. The marbles and other calcareous rocks are all from the carboniferous limestone, and entirely confined to the southern extremity of the island, near Castletown, where they occupy about 16 square miles, for the most part covered by tertiary gravel. The sandstones, schists, and granites are more abundant, but less valuable.

Of the calcareous rocks, the black flagstones of Poolvash contain much carbon and some argillaceous matter, and are very durable. The different marbles have the same properties as the carboniferous limestones of Derbyshire; and the porphyritic rocks are generally of good quality.— D. T. A.]

Foot, John, Abingdon Street, Westminster— Proprietor. Specimens of Best Bed Portland stone, and Whit Bed

Portland stone, showing different samples of workmanship.

Specimens of Roach Portland stone.

The backs show natural fractures.

Preston, William, Hawthorn Cottage, Stroud. Building-stone from Pains wick Quarries; from Sheepsoombe, and from Nailsworth Quarries.

Voss, James, Woodyhide, Corfe Castle— Proprietor. Purbeck marble, from quarries at Woody-hide, Corfe Castle, used in decorating the interior of the Temple Church, London; also used for dairies, hall tables, mantelpieces, Ac.

(The Purbeck series of beds occurs at the base of the Wealden formation, and immediately overly the Portland series. It is best developed in the Isle of Purbeck, where it has a thickness of 275 feet, 55 feet of the upper part of which is useful stone. The beds called Purbeck marble consist, for the most part, of small paludinas, cemented by carbonate of lime with much green matter. Other beds are composed of bi-valves of the genus Cyclas. They are all used for building purposes.—D. T. A.]

Gelling, Frederick Lamothe, Castletown, Isle of
Man—Producer.

Marble, obtained from Coshnahawin and Skillicore, in the parish of Malew, Isle of Man, exhibited in several forms, to show its capabilities—in the rough, with one face polished; table in five pieces; turned specimens; a vase, &c. It can be raised of large size, and of great variety.

Red porphyry, and agate or pebble, with polished faces.

[The limestone of Skillicore and Coshnahawin is of the carboniferous period, and is broken up into rhomboidal blocks, the intervals being often filled with quartz. The rock exhibits a beautiful variegated appearance, but is too much fractured, and appears to be too hard to be worked with profit as a marble.—D. T. A.]

Gowans, James, Edinburgh—Proprietor.

Group in freestone, designed and executed by A. Handyside Ritchie, 92 Princes Street, Edinburgh.

This stone is from Red hall quarry. According to the analysis of Dr. George Wilson, of Edinburgh, the average percentage of peroxide of iron is not more than -052. It is said to possess the property of hardening by exposure to the weather, and of retaining its primitive surface.

Specimen of freestone, from Binny quarry, forming the plinth of the group.

Dr. Wilson, in his analysis, says, "This building stone which has been in use for many years in Edinburgh, has been analysed by me, and found to contain the same percentage of peroxide of iron as the Redhall freestone, and I find that it exhibits the peculiarity of having diffused through it a quantity of native bitumen or asphaltum which acts as a protective varnish to the Stone, and defends it from the action of the atmosphere."

Specimen of Binny quarry bitumen candles, made from the nearly solid bitumen or mineral wax, which is diffused through the stone, and exudes in considerable quantity between its layers. Owing to its abundance, the workmen use it for domestic purposes.

Specimen of bitumen from Binny quarry, in its natural state. It has been found by Dr. Wilson to yield, on distillation, paraffine, and a liquid hydrocarbon analogous to naphtha.

Model of a steam crane, with travelling gear, worked from a horizontal shaft, and capable of raising 20 tons.

Drawing of a steam crane, worked by crab gearing, attached to B horizontal steam-engine, and capable of raising 50 tons.

Drawing of it boring machine, capable of boring holes to a depth of 40 or 50 feet; from 3 to 6 inches in diameter.

Class 1. Mining and Mineral Products.

Specimen of bitumen used in conjunction with a galvanic battery for separating the large masses of rock in the quarry. It is stated that masses weighing upwards of 6,000 tons have been dislodged by this operation from their beds. It is proposed to apply the same method to the working of coal-mines, blasting of submarine rocks, &c.

Gdtllaume, George, Southampton. Specimen of stone found in Hampshire, adapted for ornamental use.

Jennings, Benjamin, Hereford—Proprietor. Specimen of sandstone, from the Three Kims Quarries, near Hereford. Exhibited on account of its strength and durability; it is said to stand equally well on its edge or on its bed; and to be suitable for cider mills, sea walls, railway purposes, &c.

Kirk & Parry, Slea/ord, Lincolnshire— Proprietors. Specimen of Ancaster stone, of the lower oolite formation, from the quarry at Wilsford, near Sleaford, Lincolnshire. It is said to be a durable building material, used chiefly for dressings and architectural decorations, and adapted for sculpture and ornaments of various kinds. It rises in beds, varying from 10 to 24 inches in thickness: the texture is close and uniform; and it is stated that although it can be cut with an ordinary peg-tooth saw, like the Bath oolite, it will carry an arris equal to that of Portland stone.

[Ancaster stone is a fine cream-coloured oolite, cemented by compact, and, often, crystalline carbonate of lime. There are numerous beds, the entire depth of workable stone being 13 feet, and blocks of 3 to 5 tons being obtainable. The stone weighs 139 lbs. 4 ozs. per cubic foot; absorbs very little water; cohesive power tolerably high; composition—carbonate of lime 93'6, carbonate of magnesia 29, with a little iron and alumina, and a trace of bitumen. Belvoir Castle, Belton House, and numerous mansions and churches in Lincolnshire are constructed of this stone.—D. T. A.]

Lindley, Charles, Mansfield—Proprietor.

Twelve-inch cube of magnesian limestone, or dolomite, from the Mansfield Woodhouse Quarries, re-opened 1840, after a lapse of several centuries, to obtain the supply of stones for the erection of the new Houses of Parliament at Westminster. Chemical analysis:—Carbonate of lime, 5T65; carbonate of magnesia, 42-60; silica, 3-70; water and loss, 2'0.">. The debris is largely used for the production of carbonic acid gas, and Epsom salts.

White calcareous sandstone. Chemical analysis:—Silica, 51'40; carbonate of lime, 26'50; carbonate of magnesia, 17'98; iron alumina, 1*32; water and loss, 2'08.

Red calcareous sandstone. Chemical analysis :—Silica, 49'4; carbonate of lime, 26'5; carbonate of magnesia, 16'1; iron alumina, 5'2; water and loss, 2 8. From quarries which have been in work for four hundred years.

These two sandstones are the connecting link between the magnesian limestone and the new red sandstone formations, partaking of the characters of both.

[The magnesian limestones, valuable for building purposes, are chiefly or entirely those which present equal proportions of carbonate of lime and carbonate of magnesia in a semi-crystalline state. Such stone has a peculiarly pearly lustre when broken, but its colour, when worked, is light yellowish brown, not changing by exposure. Its specific gravity is very high, the stone weighing upwards of 150 lbs. the cubic foot. The cohesive power is exceedingly great, and hardly rivalled by any limestone.—D. T. A.]

Powell, Frederick, h'naresborough, Yorkshire— Collector. Building stones, from quarries in the immediate vicinity of Knaresborough.

Rutherford, Jesse, Stone Merchant, Wingenrorth, near Chesterfield—Producer.

Stone from Wingerworth quarry, near Chesterfield, Derbyshire.

Stone from Lion quarry, Wooley Moor, near Wingerworth, Chesterfield.

Stone from Bramley Fall quarry, Wingerworth, near Chesterfield: this stone is generally used in heavy works such as docks, bridges, &c.; the quarry has been known upwards of 500 years; the stone is obtained in blocks 45 feet long, 20 feet broad, and 16 feet thick, each block weighing about 1000 tons.

[The Bramley Fall stone is a light ferruginous brown sandstone, with an argillo-calcareous cement and very little mica. It weighs 142 lbs. 3 oz. to the cubic foot.— D. T. A.]

Sparks, W., Crewkerne—Collector.

Specimens of stone from the counties of Dorset, Somerset, and Devon:—

Greensand, a siliceous stone, from Blackdown Hills, Devon, used as a whetstone for scythes, &c.

Purbeck marble; Purbeck stone; Portland stone. Building stone from Ridgway; and limestone from Langton Herring, near Weymouth.

Building stones, white and calcareous, from Bothenhampton, near Bridport, and Beaminster, Dorset; also from Bath, Doulting, near Wells, and Crewkerne, Somerset.

Ferruginous stone, for public buildings, mill-dams, &c., from Hamdon Hill, Somerset.

Blue lias limestone, for docks, railways, &c., from Lyme Regis, Dorset, from Curry Rivell, near Langport, and from Keinton, Somerset.

White has, from Beer Crowcombe, and from Tiverton, Somerset. Gypsum, from the former place.

New red sandstone, from Bishop's Lydiard, near Taunton, Somerset.

Millstone grit, for paving, &c, from the Pennant quarries, Hanham, near Bath.

Carboniferous limestone, from St. Vincent's rocks, Clifton; from the Breakwater quarries, Plymouth, from Newton-Abbott; and from Kingskerswell, near Torquay, Devon.

Granite, from Dartmouth, Devon, used for Government works, Stonehouse.

[Many of the stories referred to in the above list are of considerable value and interest. The whetstones first alluded to are manufactured from hard sand concretions, found in the lower cretaceous rocks on the west part of the Blackdown hills, and quarried from galleries driven as much as 300 yards into the hill side. These concretions vary from 6 to 18 inches in diameter, and form a bed about 4 feet thick, available for scythe-stones. The beds above and below are employed for building purposes.

The inferior oolites, worked at Crewkerne as building stones, are not specially remarkable for excellence, but the Hum hill stone is durable and valuable. The Pennant grit is a rock much employed for building and engineering purposes, and belongs to the coal measures.

The granite of Stonehouse and Dartmoor is the valuable and durable material.—D. T. A.]

Staple, Thomas, Stoke-under-Hamdon, near Yeovil —Producer. Blocks of Ham-hill stone (oolite), partially prepared to show the quality of the stone.

« ElőzőTovább »