138
[United
quarries, Gluvias. Stone , from Steven’s quarry, HigherTreluswell, Gluvias; and from Newham, Kea.
Specimen of porphyry, found near Swan Pool, Fal-mouth , containing crystals of rhomboidal quartz.
Quartz pebbles ancl sand, from Swan Pool beach.
Magnetic iron ore, from Treluswell, near Penryn.
[A large quantity of excellent road-stuff is obtained inCornwall from the “chans,” or porphyritic dykes, whichtraverse many parts of the county: these elvans also sup-ply the chief building stones of the district. They are,however, not unfrequently met with in a decomposingstate, and are then quite unfit for use. The stones ob-tained from Porkellis, near Wendron, sometimes nearlyresemble sandstones. Many excellent stones, both gra-nite and elvan, are obtained near Penryn. The decom-posing porphyries and elvans yield occasionally a valuablefire-clay.—D. T. A.]
164 . Hicks, Thomas, Truro — Producer.
Varieties of porphyry, for various purposes.
[The porphyries of Cornwall and other districts, wherethe primary and protrusive rocks prevail, have beenneglected up to the present time. In the decoration ofOsborne, and some other of the royal residences, orna-mental stones of British porphyries, and other orna-mental stones, have been used. Many of them are of abeautiful description, susceptible of the highest polish,and all very durable. The greenstones, or as they aresometimes called ironstone porphyries, are now beingintroduced into London for road-making, and it appearsto prove an exceedingly good material for that purpose.—R. H.]
165 Wiiitley, Nicholas, Truro —Producer.
Varieties of porphyry.
166 St. Austell Committee —Producer.Specimens of building material.
167 Liskeard Committee —Producer.Specimens of building material, prepared in cubes.
169 Rodd, T. H., Esq., Trcbantha Hall, near Laun-
ceston —Proprietor.
Varieties of porphyry, for ornamental and buildingpurposes.
170 Jenkins & Stick, Truro —Proprietors.
Varieties of porphyry, from Tremone, in Withiel.
170 a -
Specimens of limestone glazed.
171 So when, Matthew, Barley , near Leeds —
Producer.
Hard delf-stone grit, from a quarry at Burley, nearLeeds , close-grained, strong, and durable; suitable forheadstones, steps, &c., and generally for erections ex-posed to the weather.
172 Freeman, Samuel, Cromweld Bottom, near Halifax—Producer .
Laminated flagstone, from Pearson Brow Quarry, inHipperholme, Yorkshire , and from Northowram, nearHalifax , from Cromweld Bottom and Southowram, andfrom Hove Edge and Elland Edge, Yorkshire .
Blackstone, from Ringby, near Halifax, ^ and from theElland Edge Quarry, a bed free from lamina?.
All these stones lie above the two known lowest beds ofcoal 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 Hali-fax, Yorkshire ; it lies below the level of any of the knownbeds of coal.
[The lower coal measures of Yorkshire contain someexcellent grits, well adapted for building and paving.Some of the latter are well known and very widely usedthroughout England-.—D. T. A.]
173 --
Set of dressed blocks of oolitic freestone.
174 Haigh, John, Godley Cottage, near Halifax —
Producer.
Specimens of freestone from Northowram quarries,near Halifax . Block, in its natural state; block, variouslydressed.
Flag, for causeways and floors of buildings.
Millstone grit, from Halifax.
175 Johnstone, George, Craigleith, Edinburgh —
Producer.
Stone from Carlingnose quarry, North Queensferry,Scotland. This stone has been extensively used in Scot-land, England, and Wales ; more especially at HerMajesty’s dockyards at Woolwich, Sheerness , and Chat-ham; for the breakwater at Warkworth (Northumber-land); at Newcastle, Sunderland, and Hartlepool ; andin paving the Imperial Museum at St. Petersburg .
Stone from Barnton Mount quarry, near Edinburgh :this stone can be procured in large blocks, and in anyquantity. Specimen of paving stones from the samegranite quarry.
Specimen of stone from Craigleith quarry, near Edin-burgh ; much used for stairs, landings, and fine pavings;may be seen applied to those purposes at the BritishMuseum, Royal Exchange, Custom-house, &c., London .
[The Craigleith stone is a sandstone of the carbonife-rous series, consisting of fine quartz grains with a sili-cious cement, and occasional plates of mica. It isobtainable of any practicable length and breadth, and upto 10 feet thick. Weight, per cubic foot, 146 lbs. Itconsists of more than 98 per cent, of silica, and 1 percent, carbonate of lime.—D. T. A.]
176 Luard, Beedham, &Co., Caen, Normandy , and CaenSufferance Wharf, Rotherhithe —Proprietors.
A specimen of Caen stone, wrought on face.
Four specimens of ancient Caen stone, from St. Ste-phen’s Chapel, Westminster, 16th century; St. Stephen’sChurch, Caen , lltli century; and Kingston Church, Sus-sex, 14th century; all in good preservation.
Four specimens of Aubigny stone, wrought.
Three specimens of ancient Aubigny stone from churchesat Calvados department, and from the old castle of Wil-liam the Norman, of the 12th, 16th, and 17th centuries.
A specimen of Ranville stone, from quarries near Caen .
Three specimens of Scotch granite, of which blocks of30 tons can be obtained.
[The Caen stone, obtained in large quantities and of thefinest quality from the quarries at Allemagne , has beenlong worked, and is well known in all parts of Englandand France , being used in many of our cathedrals andother public buildings. The quarries are entered bynarrow galleries opening from the steep banks of theriver Ornie, and thus have the advantage of direct watercommunication at very small cost.
The stone is soft in the quarry, of very beautiful richcream colour and very even texture. It stands exposurewell in France , but is better adapted for internal work inthe climate of England. Several very beautiful works inthis material will be found amongst the mineral manu-factures (Class 27), and in other parts of the building._
D.T.A.]