166
Class 1.— MIKING AND MINERAL PRODUCTS.South Side—Areas S. 1 to S. 27.
[United
469 Local Committee, St. Austell —Collector.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 , pre-pared in cubes.
470 Welborne, J. W., St Austell , and 38 Albemarle
Street —Producer.
Slab of rosin tin ore, from the Par Consols Mine, nearSt. Austell , Corn-wall.
Stone of the magnetic oxide of iron, from Roche Rockiron mine.
Sulphuret of copper, or yellow copper ore, from BodminWheal Mary Consols, near Bodmin.
471 White & Grant, Dalmamock Road, Glasgow •—
Inventors and Manufacturers.
Patent safety cage and detaching catch for mine-shafts,to prevent accidents from the breaking or over-winding ofropes or chains.
472 Hosking, R., Perran, Cornwall —Inventor.Reversing apparatus for horse whim and stamping
machinery.
473 Swansea Committee, Swansea —Manufacturers.Specimens of copper ore, and of calcined ore, blistered
and refined copper, &c.
474 Taylor, John, London —Producer.
Collection of rare and metalliferous metals.
475 Thorne, William, Barnstaple —Proprietor.
Pseudomorpliic spathose iron, showing the structure of
box and slipper specimens : yellow sulphuret of copper;peacock copper; foliated mundic and crystallized whitequartz; from the Virtuous Lady Mine, near Tavistock ,Devon .
[These singular formations are due to the deposit ofthe sulphuret of iron upon crystals of sulphate of lime,which have been dissolved out subsequently. They havebeen rarely met with in any other mine.—R. H.]
Crystallized white iron, with lead and Falilertz ores,containing silver, from the Combmartin Mines, in NorthDevon .
Specimens of killas, or clay slate, white iron, crystal-lized white quartz, mundic, and lead and Fahlertz ores,for the Wheal Golden Mine, Perranzabuloe, Cornwall .
Hydraulic cement and raw mineral paint, from Bick-ington Quarry, near Barnstable, Devon .
Ashlar-stone, hone-stone, clay, and granite; gravel,from Tavistock , near Barnstaple.
476 Goodhale & Reeves, for the Ringerige Nickel Work ,
Vigersund, via Drammen , Norway —Proprietorsand Producers.
Nickel ore ; from mines in the district of Ringerige, inNorway (about thirty miles north-west from Christiania ),worked only last year: containing 2’80 per cent, nickel,with 40‘46 sulphur, 56*03 iron, and 0*40 copper.
[The Norwegian mines have lately attracted much at-tention in this country on account of the cobalt and nickelores they contain.—R. H.]
477 Johnson & Matthey, 79 Hatton Garden —
Manufacturers.
Specimens of metals and metallic compoundsPla-tinum crucibles, with capsule covers; and with ordinarycovers. Capsules, spatula, and large basin of this metal;oxide and sponge platinum.
Palladium; part of an ingot; a cup, soldered with finegold: another, smaller, raised with the hammer; alloy ofsilver and palladium used by dentists and philosophicalinstrument makers; oxide of palladium; and its salts,red and yellow.
Iridium; pure metallic in vase; and the native alloy,as used for nibs of pens ; its oxide and salts.
Rhodium: metallic in vase; its crystal of sodo-chloride;oxide; and phosphuret.
Uranium; its oxide; glass vessel showing the colourproduced by the oxide of uranium.
[Platinum was discovered by Ulloa in 1735, but it wasfirst rendered available by Dr. Wollaston. The largestsupply of the metals platinum, palladium, iridium, rho-dium, and uranium, is obtained from the Uralian Moun-tains ; some is procured from the alluvial deposits of Brazil and other parts of South America . These metals, excepturanium, are commonly found combined. Uranium isprocured from pitchblende, uranite, and other mineralsfound in Cornwall and Bohemia.—R. H.]
[The colour produced by mixing a minute portion ofthe oxide of uranium in a mass of molten glass is oneof the most beautiful colours obtained by art. It is acharming golden green of an opaline lustre, so peculiaras to distinguish it from all other colours in glass.—R. E.]_
478 Pimm, Henry, & Co., 29 Newhall Street,Birmingham —Manufacturers.
Gold and silver leaf, and bronze powders.
479 Mathison, G. F., Royal Mint Refinery —Producer.
Sulphuric acid process of separating gold, silver, and
copper. _
480 Pattinson, Hugh Lee, Newcastle-upon-Tyne —
Inventor.
Specimens to illustrate the exhibitor’s process for theseparation of silver from lead: viz., original lead; crys-tallized lead; slabs of lead, to show the form of the crys-tals; rich lead; plate of silver obtained by submittingrich lead to cupellation. Large drawing to illustrate theprocess.
[This process of desilverizing lead is founded on thephysical fact, that lead crystallizes at a temperature abovethat at which silver solidifies, and in this process of aggre-gation, the silver is separated from the commoner metal.It is effected by the use of hemispherical cast-iron pans,holding about three tons of metal, which are heated by afire below them; the argentiferous lead is placed in these,and melted, after which the fire is withdrawn, and allmade air-tight below. The workman now begins to agi-tate the mass, which he does with an iron rake, removingthe solid parts from the edges, as solidification takes place.With an iron strainer the solid crystals are removed asfast as they are formed; these are nearly pure lead, theliquid mass left behind being rich in silver. This processis repeated three or four times. The mass left after the lastoperation, which contains from 3 to 400 ounces of silverto the ton, is then submitted to the process of cupellation,by which the lead is oxidized, and the silver left in a stateof purity behind.
By the original method, lead ores containing less than20 ounces of silver to the ton scarcely paid the expenseof working. By this process, ores containing only threeounces to the ton, are made to yield their silver.—R. H.]
481 Hallett, George, Broadwall , Blachfriars—
Manufacturer.
Antimony. Sulphuret ore, from Sarawak, Borneo ,Leghorn, Tuscany; oxide ore, from Algeria . Refiuedsulphuret of antimony, commercially known as “ CrudeAntimony •” used in medicine, dyeing, pyrotechny, andchemistry.—Metallic antimony, commercially known as“ Regulus,” with fracture shown; designated as “ Bestbowl Regulus.” Metallic antimony, highly refined, exhi-biting its naturally crystallized, or femlike surfaces, andits fracture; commercially known as “ Best French qua-lity Regulus.”—Used principally to harden other soft andductile metals; viz., with lead and tin for printing types;