130
Class 1.—MINING AND MINERAL PRODUCTS.South Side—Areas S. 1 to S. 27.
[United
Lead ore, from Ballyhickey mines, formerly worked,but not now in operation. Within four miles of theshipping port of Clare. Average, by assay, 77 per.cent,for lead, and 15 ounces for silver in the ton of lead.
Shell marl; dredged in abundance out of the Shannon;it forms the subsoil of the lowlands skirting the river.
Silica. This silica is suitable for pottery purposes.
[Shell-marl, such as alluded to in the above list, isusually the remains of the deposits formed by the ancientpleistocene sea. The organic remains which give rich-ness to this marl, and enhance its value for agriculturalpurposes, are remarkable for being of an arctic character.They appear to indicate the ancient extension of an icysea like that of Greenland over the greater part of theBritish - Isles during the geological epoch immediatelypreceding the present era.—E. F.]
79 Rouse, Capt., & Whitley, N., Truro —Producers.
Specimens of sands, from various parts of Cornwall ,used for agricultural and building purposes: the agricul-tural sands from Gwithian, Falmouth harbour, andPerron Porth; the others used for building purposes.
[A very large quantity of fine white calcareous sand,consisting chiefly of minute fragments of shells, andcontaining much animal matter and some salt, is annuallyremoved from the coast of Cornwall , in some places, tothe interior, and used for agricultural purposes, forwhich it is well adapted. It has been estimated that asmuch as from six to eight millions of cubic feet of sandare annually thus removed.—D. T. A.]
80 Flather & Haden, 1 Castle Mills , and 2 Broad
Lane, Sheffield— Producers.
Prepared Trent sand, or wharpe, used for buffing up,or bringing to a surface, German silver, Britannia metal,brass, copper, &c.
Prepared Welsh rotten-stone, used for producing thefine polish on silver, Britannia metal goods, &c.; whenmixed with one-sixth its weight of rape or sweet oil, itforms the polishing paste used for cleaning Britanniametal, brasses, tinware, and other bright metal goods.
[Most substances employed under the name of rotten-stone, or Tripoli , are essentially composed of silica in apeculiar state of subdivision, the actual particles of whichthe whole is made up being crystalline, but the massearthy, and often reduced by compression to a solid state,having a slaty fracture. In most cases, the origin may betraced to the remains of infusorial animalcules, and occa-sionally the presence of carbon, and a little resinousorganic matter which shows this still more clearly. Thename Tripoli is generally understood to apply to all theearthy varieties (of which there are several) in whichsilica exists nearly pure, but in a very minute state ofsubdivision. Rotten-stone is limited to those which arelight and friable, and of very fine grain. It occurs ratherabundantly near Bakewell, in Derbyshire , amongst thecarboniferous limestones, but is often met with in otherrocks.—D. T. A.]
Prepared lime, used for producing the bright blackpolish upon German silver, electioqdated, and silvergoods.
81 Solomon, Thomas, Truro— Producer.
Varieties of hone-stones, used for sharpening edge-
tools, from Perran Porth, near Truro ; Lostwithiel; Feock,near Truro; Kenwyn, near Truro ; and other localities.
82 Scrampton — Leicester —Producer.
Specimens of Whittle Hill whetstones and hones.
84 Meinig, Charles, 103 Ljeadenhall Street —Manufacturer and Dealer.
Circular grindstones, for glass, mineral teeth, fine tools,&c.; made of sandstone, from the exhibitor’s quarry inBohemia , producing fine edge, and polished surface.
Grinding lathe, mounted with these grindstones, -withcircular oilstones, &c. Mounting for flat oilstones,sharpening differently on different sides. Specimens ofdressed oilstones.
Multiplying hand-frame for circular grindstones; oil-stones and polishing stones on Mr. Eden M'Donall’sprinciple.
Multiplying hand-frame, with horizontal movement.
[Grit stones or grinding stones are, all of them, varietiesof sandstone; their abrading or polishingpowers dependingupon the degree of hardness of the stone; the size of theparticles constituting the mass, and the silicious charac-ter of the stone. The Bohemian stones have long beenimported from Germany , and used by jewellers for polish-ing small works, such as the settings around gems. Thesestones are fine and silicious, and for small work cut well,and keep a good point.—R. H.
This large and important series of grindstones includesalmost every kind used for manufacturing purposes inLondon , and obtained for various parts of the world.The qualities of the stones, their relative excellence, andtheir respective uses will be easily understood by a care-ful examination of the series.—D. T. A.]
Specimen of rock from the Arctic Regions.
86 Bank Park Pyropolite Works— Manufacturer.Figure in terra-cotta ; a bas-relief ornament.
87 Potter, William, & Co., 87 Aldgate , and Cromford ,Derbyshire —Proprietors and Manufacturers.
Specimens of fluor spar, calcareous spar, calamine,white-lead ore, lead ore, sulphate of barytes, and sulphateof barytes manufactured as a pigment. From the Dinah,Goodluck, and other mines in the vicinity of Cromford,Derbyshire.
88 Falmouth Local Committee —Producer.
Quartz, pebbles, and sand, from Su T an Pool, nearFalmouth.
89 Nicholls, J., Truro —Producer.
Fire-clay, used for stopping furnaces.
90 Whiteway, Watts, & Co., Wareham, Dorsetshire and Kingsteignton, Devonshire —Producers. *
Blue clay, used in potteries, raised from the exhibitors’pits called Furzebrook, near Wareham, Dorsetshire .
Black and carbonaceous clay, for pottery purposes.Pipe clay, for making tobacco pipes. Top clay, for brownstone-ware purposes. Alumine clay. Draining clay, fordraining tiles; all from the pits of Kingsteignton.
91 King & Co ., Stourbridge —Producers andManufacturers.
Glass-house pot, made of Stourbridge fire-clay, formelting the ingredients of flint glass.
Model of glass-house furnace in fire-clay.
Segment of D-sliaped gas retort, made of Stourbridge clay. Segment of round gas retort. These retorts areof greater durability than those made of iron.
Crucibles used in fusing metals.
Specimen of best clay, in its raw state, used in themanufacture of glass-house pots, peculiar to the Stour-bridge district, and obtained from the mines of the exhi-bitors ; and of the best black clay, used in the manufac-ture of crucibles, for melting steel.